You can’t do it on clearnet without some reputation either. I meant that you can register anonymously, than work yourself up to get some reputation and rights, than you can edit your favorite political post. I think the 2 things are orthogonal.

You can edit wikipedia fully privately, if you live in a similar jurisdiction. There are some limitations on Tor, but from these articles it sounds like it’s possible to work it around:

• https://en.wikipedia.org/wiki/Wikipedia:Advice_to_users_using_Tor
• https://en.wikipedia.org/wiki/Wikipedia:Open_proxies

It’s not super easy, but it doesn’t sound like some insurmountable obstacle.