Epic Games

User reviews are almost impossible to get right. On Steam and GOG, they are easily and routinely abused. Steam took some steps to tackle review bombing, but even when it detects it, there's no protection against marking reviews as helpful or unhelpful, which is sometimes used to the same end as review bombing for reasons that have nothing to do with the game content or technical aspects. There is also no active screening for hate speech and things of that nature, with the word filter often bypassed.

Epic supports user ratings and offers the players to rate games at random as to prevent abuse.