Yeah, if anything I think Fortnite does a good job of avoiding gambling and preserving the integrity of free-to-play.

Loot crates, which are basically slot machines, don't exist. You buy what you see, a skin.

They make a lot of money from skins but once again, there's no in-game advantage. It's purely cosmetic so at the end of the day even if you don't give Epic a dime you're still on a level playing field with everyone else.

I agree, Fortnite handles this pretty well. The only thing I would describe as somewhat manipulative would be their store. Having a rotation that only lasts a day or two rather than allowing players to purchase the items that they want evokes a feeling of "If I don't purchase this skin now, how long is it going to be before I get another chance?" I have a few friends who stockpile skins that they think are "alright" just in case they want to use them in the future.