As someone that only used the official app on iOS, I have to disagree. For me every 9 or 10 posts in the feed there was a “promoted” post. Using the compact view they aren’t huge ads like OPs one here, just like any other text post but they say “promoted” so you know it’s an ad. Also never had this “entire feed becomes ads” either.
Raises hand. ~13 year old account, just deleted it and basically haven’t gone back and don’t intend to.