You can win but if you want to beat the house its never possible because the room will take certain percentage as commission from each hand but they are not investing anything since poker is pvp not player vs house unless its blackjack. Rake fee is literally less in the online casinos so say thanks to the crypto casinos instead of trying to win them since you have to pay a lot and lot other expenses if you are going to an offline casino...
Even if poker is a PvP kind of game the casino still has expenses to cover and since they are giving a service and they are using some of their resources to keep the poker tables online then it is natural they take a rake, and as you say this rake is lower than what we see at physical casinos, however I can understand why some may find difficult to profit from it as the number of poker players on those websites is limited and many are decent players so unless you are way above them in terms of skill then you are not getting any profits against them.
In 2021, online casinos are flooded with gamblers than the physical casinos because even who never thought about going to a physical casino is even playing at online due to the convenience they get so the rewards are enough to be honest but its a game will deceive everyone in the long run so its a game that can beat everyone when they are making more bets so the houses are making more money.