Overwatch 2

Microtransactions in Overwatch 2 are summarized as...

Overwatch 2 is a free-to-play game. The main monetization of the game is the purchase of cosmetics using a premium currency.

Shops

The store features 2 primary ways of purchasing cosmetics using the premium currency. The first is through an always rotating limited time store. This store features nothing but bundles and each item can not be obtained individually. Items in this store are often on sale with a discount percentage even though these items can not be obtained otherwise, this practice is illegal in many countries.

The premium currency can be obtained for free through weekly and season challenges. The rate at which you earn these is incredibly slow. Earning enough for a single legendary tier skin will take you close to a year if you complete all challenges. Take it as a free sample designed to lure you in to spending more.
Later on Blizzard also added Premium Currencies to the Battle Pass after a lot of player complaints. The currency you earn through the Battle Pass is still not enough to purchase the next Battle Pass, like is common in comparable games.

The second way of purchasing cosmetics is through skins that are always available in the hero gallery. Most of these skins were available for free in Overwatch 1 through the use of in-game earned Credits. The credits you have earned in Overwatch 1 are still available in Overwatch 2. New credits can be earned for free through the Battle Pass or through challenges. The rate at which you earn credits is far lower compared to Overwatch 1 The cost of cosmetics for Credits is vastly increased in comparison to Overwatch 1. Many types of cosmetics are 2 or even 4 times more expensive in Overwatch 2.

The game features another currency called "Overwatch League Tokens". These can be obtained for free by watching the Overwatch League eSports streams. Alternatively you can purchase these tokens with real money. The price of both the tokens and the cosmetics has increased dramatically as compared to Overwatch 1, even for skins that are not new to Overwatch 2.

Battle Pass

Overwatch 2 features a Battle Pass. This Battle Pass has a free track, but the items earned from this track are generally low quality. The Battle Pass does not earn any Premium Currency, and thus if you want each Battle Pass you will need to purchase all of them separately. A Battle Pass lasts roughly 2 months, so this will come out to roughly $60 a year.
Battle Pass levels can be purchased using real money to speed up your progress.

Previously, new Heroes were locked behind the Battle Pass. The hero was unlocked about halfway through the Battle Pass for free, or instantly if you purchased the Premium Battle Pass. If you missed a Battle Pass you could complete a lengthy challenge to unlock the character, or you could pay 10USD to unlock the character right away.

Mythic Skins are the top level reward for Battle Passes. These skins aren't earned directly, instead you earn a premium currency called Mythic Prisms. One completed Battle Pass earns you enough for one full Mythic Skin. If you missed a Battle Pass but still wish to purchase the skin, you can purchase Mythic Prisms. This is yet another premium currency. Mythic skins are purchased in tiers, with the base tier costing 50 Prisms, and each level costing an additional 10 Prisms. The top level is 4, unlocking this costs 80 Prisms in total. It costs 75 USD to purchase enough Prisms. As previously stated the Premium Battle Pass earns enough Prisms to purchase one level 4 Mythic Skin, so you don't have to spend 75 USD. But if you wish to purchase multiple skins, you will be paying that price, perhaps many times over.

Other monetization

The Beta for Overwatch 2 featured a pre-order bonus that got you in to the beta instantly. Otherwise the only way to get in was to sign up and hope you got lucky.

On top of that Overwatch 2 features PvE missions, but to play them you need to buy a bundle that costs $15. This bundle contains some other content, such as character skins, but it's the only way to purchase access to the PvE even if you do not care for the other content.

More and more cosmetics are being added as "collabs". While some of these might be considered genuine "collabs", others are straight up advertisements for real world products. This includes a "collab" with a sunglasses company and "collab" with a luxury car company. These are advertisements masked as something else, while also being paid cosmetics.

Overwatch 2 is a very expensive game and will require significant time and monetary investment if you wish to unlock cosmetic items. With 7 different currencies, 3 of which are Premium, you will have a difficult time unlocking everything you might want.