Strange, outside of the CBS logo before Paramount Plus things start on Amazon (I hate every noun in that sentence progressively more) I haven’t had an ad in almost a year (from that same subsection of that same platform). Apple put some ads up for other shows of theirs, but made them skippable.
Twitch is probably the worst for ads, I sometimes have to watch one.
As a child of Saturday morning cartoons, ads today aren’t 2% as bad as what we used to endure, and on demand shows (you can watch a series even if your missed the first episode, instead of waiting for the season recap, or entire season re run before the finale), and the ability to watch, and pause, damn near anything, makes the experience at least 50x better, so I’d say we’re about 2000% better off than I remember us being.
Disney used to run ads for their other shows on Disney channel, no non-Disney things, but they were still interspersed, that was a child formed in my brain what an ad was to be “anything that delays the content is an ad”. Pedantically FBI warnings and producer logos are ads.