> Do we need their permission to implement it? Could be a browser extension.

Instead of bandaid-hack solutions leading to perpetual cat-and-mouse, why not build a citizen-owned platform from the ground up, as detailed here:

https://www.noemamag.com/the-last-days-of-social-media/

You would barely even need to advertise for it if it was obviously better than any of the existing corporate slop. It would sell itself, and the "profit" would be the end result that everybody can enjoy.

Or post it as a reply in url, hope for the silent majority to support it enough to send it to the top. If the platform only supports out-links it's tough.. maybe use QR codes as avatars?

true. but that's on the individual vs. the platform so it won't be perfect adoption. better than nothing tho.