"We have a problem with bots" - "Just create a firewall rule, whatever"
But the immediate response to bots shouldn't be "make everyone go through a captcha". There's lots of nuance that you can tune to deal with your particular situation, but the first thing I'd do is block known bots or ASNs, set up a limit to trigger (bots usually don't make 1 document request a minute), set up higher limits for users who (seem to) have a valid cookie indicating that they are logged in, set up different thresholds for certain countries that are more risky etc etc.
What you need to protect your service depends on your situation, it's not a one-size-fits-all solution. E.g. I find that I have no automated contact form spam once I add a simple JS to add some data that isn't standard, but I'm sure that wouldn't hold up if there was enough incentive to try to get past it.
But the OP mentioned not just free services, but e.g. webhosting logins. That's just sad, as is Cloudflare's community being behind an aggressive captcha. I'm a user, I'm logged in, I've posted before, I'm in good standing, yet when I go there, I need to solve a captcha. When I then go there again an hour later, guess what, another captcha.
Either there's another reason I'm not seeing or it's just lazyness as in "we need to have a forum but we really don't want to spend any resources on it, just put up an aggressive captcha that'll filter out most bots and everyone but the determined users".
> I'm a user, I'm logged in, I've posted before, I'm in good standing, yet when I go there, I need to solve a captcha.
Though consider the fact that taking over someone's account shouldn't give you (a spammer) unlimited access either. The spambots you see on Twitter are mostly cred-stuffed accounts. It's a hard problem. Existing accounts are more dangerous than fresh accounts.
Imo, "write your own password" should be a thing of the past. Services should just auto-gen a password or there should be a way to require the OS (like a password manager) to generate one to avoid cred-stuffing. We're letting down the average person by making them come up with unique passwords for every service instead of just helping them. Though I'm way off topic.
