My Gboard started doing that when I type normally!
I gave up using swipe typing because it loves to pick words I never say, have never said, and will never say (especially not in the context of the rest of the sentence, that Gboard knows about and will offer (incorrect) corrections on)
Good thing adblock didn’t work on the browser version of Prime video last time I used it after getting tired of the ads on the app version!
It’s possible they’re embedding ads now though