Good question.
First of all, CS:GO. But not because it was bad or anything. I rage hacked, then got banned. After that, I hacked again and got banned again. After that, I quit for good. Until it has become free. Until I could, I got my free prime status.
The second game for me is also Genshin. Even tho I only bought the monthly welkin moon, for 1 whole year. And then, I got really bored of it, and I just don't feel to log in and doing anything. Not claiming easy event primos, not spending resin, not doing the daily commissions. And don't even do the abyss floor resets, even tho I became very overpowered with OP artifacts, weapons, and characters.