I use paypay whenever possible for online transactions
1) the transaction is unique to that one transaction, can't be use again if someone is scamming, In fact if the transaction for some reason gets split for backorder etc. only the first transaction is allowed, and backorder will require another paypal transaction.
Unlike bank card transactions where if someone gets the card it can be continually used until you stop it.
2) I did have one case of my paypal account getting hacked. I was notified of the transaction, called paypal and within minutes they had blocked whomever had accessed the account fully refunded my money back to my bank account, notified teh bank of the transaction.
I ONLY use my credit card online if (a) paypal isn't accepted and (b) they use secure transactions that require I enter my bank card secure code and (c) state they do NOT store the bank card code.
Ebay?? there are things I buy on ebay, great source for some obsolete/old/unique items. Like anyplace it has it's upsides and downsides. I will say in 20+ years of using ebay I only disputed ONE transaction (didn't recieve the item).
If one decides not to use certain things due to political reasons, I suspect if you REALLY follow that, you'll find you can't do anything and will slowly starve to death.