how profitable do you think blockchain games are?

do you think people could become millionaires by owning digital assets in a digital world? like in earth 2 io, crypto kitties, axie infinity, alien worlds, lost relics to name a few blockchain games.

Of course millionaires can exist. Look at Second Life for example
https://fortune.com/2006/11/27/anshe-chung-first-virtual-millionaire/#:~:text=Anshe%20Chung%2C%20a%20real%2Destate,worth%20more%20than%20%241%20million.
...and this was 2006.