Don’t worry about getting banned. They’ll just backlist the card you used and close your account. Easy enough to get around. Send them your video and demand they refund you while you’re on the phone with them. Use the word chargeback liberally. You’ll either get refunded quickly or fuck them, make them get dinged with a chargeback.

I’ve used Linux since the 90s and I’ve never installed a flat pack or snap or whatever. They’re not required.