while I agree sometimes a simple answer is sufficient, his post was in his own way intended to highlight the fact that you were, in fact, acting quite paranoid about such a large company, and that it is unfounded.
Trust me, I don't mind any level of hating on EA, but you were in fact hating on them, and accusing them, although rather indirectly.
Just by stating your distrust for your CC details in regards to how MS or EA would handle them is in itself an attack on that companies crediibility and responsibility. I'm just surprised in this day that that level of distrust could be harbored towards such a large and public company. Were there anythning underhanded being done with peoples personal details, especially that of a credit card, it would almost certainly spell doom for that company and it's shareholders.
While corruption exists, it is typically not handled in such a manner on the industrial side. Some guy dumpster diving for your reciepts and CC statements is a MUCH larger risk than EA.
If you want to feel safer, get a firewall and a paper shredder, that will go miles farther than removing your CC from your Live account.