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.gg has seen decent adoption in newer gaming related sites. But that's the only one I can think of right now.

Not only is .gg expensive but phonetically awkward on the telephone, something I didn't consider when registering my main domain years ago.

Every time I see a ".gg" domain, I read it out as "gee-gee" -- a colloquial term for a horse...

.io is an interesting example - because it is quite expensive yearly, poorer techies avoid it.

So anyone who thinks .io is as good as .org is probably not price sensitive, and might be contributing to the worry that .org will go the same way eventually.

.ai is even more expensive, but I haven't noticed .ai domains being used for things I visited, only heard that they are used.

ccTLDs are vulnerable to censorship by the country owning them.