Play2earn games allow to earn money to many people. That is why they are so popular and attract so much attention.
Before appeare Play2earn games gamers only spent a lot of money for playing games. Now they get opportunity to earn money by playing.
Such opportunity attracts attention of many people.
The opportunity to earn money attracts many people to cryptocurrency industry and Play2earn games.
The more you play the more you earn.
It is a new and very attractive conception for games and many gamers are glad to earn more money by playing.
That is why Play2earn games are so popular now.