How long until they give in and allow it? I know they will eventually, since they are losing out on lots of $$$.
They are in business to make money, not foment revolution. This is how it works for very big companies.
Beware: banking will be really hard. You need to accept money from ad buyers, and forward most of it to ad sellers. Most of the ad buyers are doing things that are illegal under federal law, so banks won't deal with them. They might have suitcases full of cash, but it's hard for them or you to turn that into ACH deposits for the ad sellers.
That problem may be solvable, just a heads up that it won't be easy.
It just doesn't pay that much, honestly. Even they seem to restrict what they show (e.g. haven't seen flowers/edibles sold directly yet).
I'm inordinately curious why you chose to characterize this as "spineless". Even as someone who is 100% for, and actively campaigns and lobbies his representatives to consider some of the bills in his state's upcoming legislative session-I completely understand why a payment processor wouldn't touch this with a ten mile long pole-given where we stand when it comes to Federal legalization of cannabis.
You can be an activist and stand up for the right to blaze all you want as a company, but if the Federal government and more specifically the IRS decides you've nipped it in the wrong bud (pun probably intended), you and your company are in for a very difficult battle that will almost certainly end up with said company shutting down and one or more of your management team facing Federal indictment.
And even if those people walk away scot free, it absolutely is not worth it unless you have an infinite supply of money for legal fees fighting-of all entities-the judicial behemoth that is the United States Attorney General's office.