When I used to advertise with Google Adwords, I protected myself from what I saw in posts by others complaining that Google "running wild with overcharges".

I would buy only prepaid CC's with say a $200 limit. It worked well for a time, until Google finally figured out a way to distinguish prepaids from regular credit cards. When they stopped taking the prepaids that's when I stopped buying Adwords, but I also noticed I had no reduction in business, it was virtually the same as before.

Nowadays if the business won't take a prepaid with a limit - - - I don't want to do business with them, cannot trust them as far as I can throw them.

I have not tried crypto, but seems that basically a one time crypto payment would be a fixed amount, once.

For me, giving someone your $5,000 credit limit credit card is just like putting a stack of 50 one hundred dollar bills on the table and telling them, take what you need, I trust you. Well, no I don't.

Also, I discovered that if a business is not observing your request to stop re-occuring charges on your card, like broadband internet cable companies, web hosting co's, and so many others, it was a waste of time calling them and complaining, or writing letters, etc. It was WAY easier just to call up my credit card customer service and report the card stolen, then the number is cancelled for good, they send a replacement card next week. I even ask for and receive "expedited" service, they overnight the new card to me.