* In-feed ads. These include ads for content prominence (preferential placement for creators), articles with link-out, ads for Google products and services like purchasing movies and shows in their store, and ads for Google product features.
* Modal ads in videos which they facilitate. That is, pop-up ads in content.
* Ads for merchandise under the content.
* Ads for paid subscription to channels.
* In-content ads in the form of creator sponsorships. These are becoming egregious.
The official app is absolute GARBAGE now. I can't even turn off shorts anymore. I'm on the verge of cancelling Premium. Once the Digital Markets Act comes into effect in the EU in a couple of months I'll be installing alternative frontends for YouTube which include SponsorBlock.