The issue is that most administrators are at a bit of a loss.
Either wake up in the middle of the night to see your instance be fediblocked by half the network because you weren't looking 24/7 at the registrations and someone decided to use your instance for spam.
Or introduce a captcha, but reduce accessibility for those who need it (although this only has to be done once at registration).
Computers have become increasingly better at solving complex issues, and we're getting to the point where it's complexity needs to be exceptionally high to provide reasonable protection.
This is also why audio captchas have been slowing disappearing, they are quite easily machine solvable nowadays and they've kinda reached the maximum complexity they can have before people can't solve them anymore either. (The computers have won)
The same is what you're seeing with image captchas right now, you've probably noticed they're almost getting surreal at times, this is the only method that still has a strong enough complexity.
Keep in mind administrators aren't implementing captchas out of spite, it's purely because there aren't that many other options left as a first line of defence against spam! If a better solution presents, I'm sure everyone moves as soon as they're able.
(If you have issues with the captcha on a small scale website, you may try mailing the admin! Many are more then happy to manually approve your action)
Long post
Ableist techbros, internet, accessibility
