It's two examples of a "company's politics getting them killed by Visa/MC" unless I'm misreading what you said.
Nope.
Jared Holt made an edgy 2009 Facebook post calling Freshmen at his university queers. People on the right (Styx666) want him canceled from Right Wing Watch for being a homophobe, and Styx has been aggressively pushing this for multiple years now. Jared Holt gets people cancelled - so it's OK to cancel him back, right?
Adeel Raja, an independent journalist, said at the height of the recent Israel-Palestine conflict that the word "needs another Hitler". People on the right (Lilith Lovett) start begging for him to be fired too. Now in Raja's case, he was fucked either way, the Jews were going to take his badge and gun regardless. To even try and get him fired is a complete waste of time.
In both these instances, they perpetuate an abusive system of anti-freedom. This sets the conservatives up to fail long term. Since the system defines what is cancelable, there will always be more of the right to ruin than the left. All it does is validate the system's methodology, reinforce the standards for what is deemed cancelable, and beat the drums for the left to follow suit with.
You can claim it's just "holding people accountable to their own standards", but their standards fucking suck and I don't want people accountable to those standards. This is outright endorsement of something you don't actually approve of.
These people and their efforts only serves the purpose of encouraging an East Germany style domestic surveillance system where neighbors spy and report on one another. It's very cringe.
Mastercard and Visa didn't need neighbors to mob each other. They identified services that were effectively giving money to political dissidents and neutralized them.