An interesting bit of the bill is that it doesn't just draw it's prohibitions against the game's publisher, but also against digital game distributors.
So imagine EA looked at this bill and went "Fuck it, we're just gonna release our game anyway" and attempted to publish a game with forbidden microtransactions on PS4, Xbox One, and Origin on PC. If Sony and Microsoft went along with it and distributed the game with those banned microtransactions in place, Sony and MS would be breaking the law to do so in addition to EA.
That means that Steam, EGS, Sony, Nintendo, Microsoft, GOG, Humble, all of them are going to have to do something to implement this bill to avoid liability falling on them from publishers looking to still make use of the prohibited microtransactions.