I have a business idea:

Vintage social media.

Only media that verifiably exists on the internet before 2021 is allowed. That's still billions of cute animal photos and videos.

EDIT:

And a sister project: RAW-only social media. Only photo/video uploaded as raw sensor data (which even phones can take now) is allowed. Metadata is stripped, and they're post-processed by the site.

Why? RAWs are technically possible to fake, but difficult enough to deter lazy slop spam. As a bonus, they can't be heavily edited either; they're unprocessed, unglamourous slices of reality. And they can be served in HDR with modern compression, as a cherry on top.

...Now I just need a few billion dollars to host it, and about a trillion to survive anticompetive attacks.