Quite correct and more, Steam is a big fish in the gaming scene and far less wedded to a single money processor as Patreon is. If Paypal or other creditcard firms tell Patreon to jump, they have to comply sooner or later, because they have no other substantial payment options.That's absolutely not what happened.
Patreon never gave a care of what was on their site even though it was against their TOS until they received complaint from both Paypal and Mastercard threatening to leave if Patreon didn't comply. (And subscribestar might go the same way soonish).
Now unless there are some legal threat against Steam hosting those(which is still a possibility in the future), they won't give a flying fuck.
Steam for all their obvious faults has a multitude of payment options, a single provider option simply has not the pull to force Steam like they can Patreon or SS. Steam only fears various government regulations and public backlash.