I know it's safe for Genshin Impact and Honkai: Star Rail. Mainly because they allow you to top up using your UID, so you don't have to enter your credentials.
I'm wondering if it's safe for Pokémon GO, since you have to give them your login details. The reviews are good, but there are only 60 of them, so they could be fake. I think it's probably safe since a lot of people use Lootbar for other games, but I really don't want to risk something happening to my account.