I'm definitely sure that (at least) Teddit uses official APIs (https://codeberg.org/teddit/teddit/wiki#oauth-vs-non-oauth https://codeberg.org/teddit/teddit/wik

I'm definitely sure that (at least) Teddit uses official APIs (https://codeberg.org/teddit/teddit/wiki#oauth-vs-non-oauth https://codeberg.org/teddit/teddit/wiki#oauth-vs-non-oauth). Are you confusing it with Nitter (which does use Twitter's undocumented APIs)?