Even if you could afford the equipment to make sure you don't have a single molecule of shit on your shoe, you couldn't operate it. Most people couldn't. So what gives? How is it possible that people have parties and then not endless discussions for decades and centuries about this unsolvable issue, right up there with how many angels can dance on the head of a pin?
Because they're not playing games is why. Because it's simple, if you don't bend over backwards to make it seem hard. You don't walk through shit on purpose, and before entering you check your shoes to your best ability. The end. There will be small percentage of cases where this fails, and that's fine. Spirit of the law and all that.
You do the same with genAI. If you are worried it's too much, "the wrong kind", whatever, you simply ask them. Because you have good intentions and will respect their answer, you have no reason not to do that. If you don't even have anything you're unsure if you can upload there, it's totally moot.