.io never went away for tech
you'd think the mobile app development bubble would have popped 10 years ago but it just kept going despite not really delivering value to most people that feel that they need one
2020's .finance is still popping in the crypto space, notably many, maybe even most of those ideas do make revenue for the creator, in comparison to a random registration on a whim that sits in stasis forever
I can see the same for .ai domains