To get familiar with the website, its games, and everything else, there's a fun mode.
Fun mode, what is it?
Is there really such funny modes available on casinos for users to experience?
That's more than enough to see how well the site works and try a few games.
It can be achieved if a casino has a demo mode for players to try the site, test games and the mode is different than what you said. Demo mode, not fun mode.
But if you want to evaluate how the casino operates, you'll still need to deposit your own money. For your first deposit, it may be better not to deposit too much, you can start with a small amount to test how everything works, and if you happen to win, you can also check how the withdrawal works. That's almost always what I do. After that, if you're happy with everything and you don't see any negative feedback about the casino from the community, you can deposit larger amounts and continue playing.
It's one of first principles when trying a new service.
The first principle: don't register it with your main email, use your alternative email or throw away one.
The second principle: don't do KYC.
The third principle: if you want to fund your account, try with small fund, and test withdrawal to see how the site works.