Is the .io wave of 2016-ish already gone? The only .io domain I use often is github.io, but that isn’t even their main domain.
Was .io a fad and did it already pass?
I think there's been a few .io registry issues over the years that have lead people to reconsider using .io as part of business critical infrastructure. I think it's not really gone out of style yet though. I imagine some of the new gTLDs will start to take precedence over .io like .app and .dev, and a lot of people will just go back to the venerable .com.
The hip domain is .so Somalia