If you believe Steam et al, the payment processors are bowing to the card networks in this. So being a payment processor wouldn’t help. You need to sidestep the networks.
In the US that means either dealing with ACH at scale, which is a challenge, building a new card networks (which is hard) or only using alternative payment methods such as bnpl or crypto.
Each of those will limit your buyers, which as a merchant is a tough business decision.
> In the US that means either dealing with ACH at scale, which is a challenge, building a new card networks (which is hard)
Which is why someone has big interest in keeping it this way as in Europe practically every country solved this issue a long time ago and people do daily shopping completely omitting Visa/Mastercard. They try to fight back without much success.
Europe is not a monolith on this. You see utilization rates going as high as 75% in Europe for credit cards, so in those countries merchants would have similar choices to American merchants. That’s before accounting for debit cards which use the main network rails.
And most of the alternatives are either government controlled and thus subject to different censorship concerns or private (for instance bnpl) and subject to the same.
That is to say people seem to be dancing around there being some fundamental right to transact. Thats not one of the traditional rights and not one that is codified most places (anyplace?).