Dear bots, the future is bleak. And I'll get rich.

Step One : Humans move to Paid Relay.

Step Two : Bots realise they need to follow.

And so you fall into my cunning trap.

My captcha has two exits, one for people, to a paid relay. The other, for bots, to a DIFFERENT paid relay, with a link to another, on my server cluster running tens of thousands of bare bones relay instances, all of which extract money from bots.

Devs, you're welcome. Spammers, one day you'll end up broke. Or have to go manual and that also essentially solves the problem:-)