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You cannot display esrb rating without actually passing their classification process.
That's why I prefer IARC.
This way, developer will get rating classification from multiple regions at once.
Maybe adding IARC process as the optional for developer who need rating classification. Doing this process on their own cost a lot of money while IARC is free.
Yeah but to be fair that's because the devs did not expect the players to be able to hack their way into a part of the game that was never meant to be accessed.
OP. Steam does not require any rating. Deves are free to put what ever rating they have up. You cannot aply such things without the explicit consent of the developers.
Devs don't set the rating, they just get the game rated. Getting the game rated is not a legal requirement but it is up to the store whether they will sell games that have not been rated by the ESRB.
That said, most likely their system incurs a licensing fee and may scare away developers who would be forced to comply with their rules, even for non-gaming software.