There are only 99 registered domains, a few of which are probably owned by the registry itself.

At $2,500/yr/domain, they're not exactly making bank. The cost to maintain all of this probably eats into the profit a bit.

Lots of people had the idea that they'd get a million customers and so even at one dollar per customer they couldn't help but make money, the reality in a lot of cases was few customers and no route out.

A handful of general purpose gTLDs work, there's one quite popular in Russia for example, using Cyrillic characters instead of Latin, they have a broad base of paying customers.

Most of the rest are pure vanity and can be expected to have similar lifespan to a vanity .com domain. Some will be sold to speculators, some will be expensively dormant for years, many will be abandoned and forgotten.

Mostly gTLDs were/ are a way for ICANN to make a lot of money exploring stupid people's greed.

I am keeping an eye on decommissioned TLDs - https://twitter.com/fanf/status/1245512707459158020?s=21

Most of them are closed .brand TLDs owned by companies whose business isn’t DNS. The struggling open TLDs seem to be traded and collected by big registries that can get economies of scale, rather than closed, so there is a limited way out. I have seen at least one .brand TLD (.bond for Bond University) converted to an open TLD and sold to a big gTLD registry provider.

I can see that having them as Tweets is delicious if you participate because you can just RT them with context but I'm the sort of person who likes big piles of data to contemplate at once.

In the '90s people told that buying lots of .com was a waste. And now we have domain hoarders making millions.