Anyone who sends them money is a fool and a coward. You made your bed, lie in it. Paying them won't make it go away. If this happens it is time to come clean with your spouse and tell the extortionist to piss off.
Cowardice, or its opposite courage, are utterly unrelated to anything involving marital fidelity.
I mean, it makes just as much sense to say they found the courage to cheat!
Absolutely untrue.
A brave person who is unhappy (or has unmet needs) in a marriage would talk to their spouse about it. If they couldn't fix the marriage, they'd ask for a divorce.
It's much easier and less painful to violate the agreement of monogamy that you made. The fear of the pain of honesty and/or divorce is what makes people cheat rather than work on a marriage.
It's irrelevant whether they're happy or not. Violating an agreement you made with someone behind their back for your own selfish reasons is cowardly.
If you are too afraid of whatever consequences there are to be honest with someone and then violate your agreement with them, you made a selfish decision based on fear, which is the definition of cowardice.
Your redefinition of coward is ridiculous.
Reality check: Most states have abolished fault divorces entirely, and in all of them the legal consequences of cheating as such are generally zero.
Regardless, even a no-fault divorce is a devastating event for most people, even if only financially.