yes, they were one of the most profitable games some 3-4 years ago, but the thing is at peak hours, you will see a ton of regs playing these games, this is due to a ton of stables staking players to play these games, So they are still likely profitable, but with more regs becomes less ROI, and with less ROI you will encounter higher variance/swings so you have to be really well rolled to play them, and not get discouraged if you encounter a 100 buyin downswing at some point if you play a lot of volume.
but yes there would be a decent amount of fish in them or they would not be profitable even for the regs.