probably crypto-only websites are way more niche than the big ones like everest and pokerstars, right?
of course not

More like vice versa: crypto poker rooms are very close to hear something like
"omae wa mou shindeiru" (c), he he.
In the same time, pokerstars (i don't know about everest) is in 100 times bigger and have a lot of stuff to do. This is not funny, rather sad that poker on crypto is not so famous as on offline.