For the past ~15 years I have tried for the most part to boycott:

• American Express for being an #ALEC member (which supports #climateDenial and obstructs public healthcare, public education, immigration, gun control, etc), and for participating in the #Wikileaks donation blockade
• Visa for pushing the #warOnCash (member of #betterThanCashAlliance.org and offering huge rewards to merchants who refuse cash), for participating in the #Wikileaks donation blockade, and for blocking Tor users from anonymously opting out of data sharing on their credit cards
• Mastercard for pushing the #warOnCash (member of betterThanCashAlliance.org), for participating in the #Wikileaks donation blockade, and for blocking Tor users from anonymously opting out of data sharing on their credit cards

Discovercard has always been a clear lesser of evils. So Discovercard has earned the majority of my business whenever cash is not possible. But now I hear chatter that #Discovercard might merge with a shitty bank that had an embarrassing data leak by an Amazon contractor: #CapitalOne. I was disappointed when Samual Jackson promoted #CapOne. Capital One supported Trump’s Jan.6 insurrection attempt among other things.

So what’s left? JCB (Japanese) and UnionPay (China). JCB pulled out of the US like 10 years ago. People outside the US can get a #JCB card but then IIRC it uses the Discovercard network in the US and the #AmEx network in Canada.

I already favor cash whenever possible. In other cases it will be hard to choose the lesser of evils between CapOne and Mastercard.

update

Found an insightful article detailing a loophole that the fed gave to Discovercard which is why Capital One intends to buy it.