If you want old stale memes just make a Facebook account. They’re about 10 years behind at all times. I don’t think they’re over the sassy cat at the table meme yet.

There is an iOS app. It’s called vernissage. https://apps.apple.com/us/app/vernissage-for-pixelfed/id1663543216

They always could? These are public facing platforms. You’re being scraped by far more than just meta.