Had many instances of this, tho not with airlines (yet). Online merchants of all types have been locking my accounts and declining transactions because I use a VPN and hardened browsers. Banks have been freezing credit cards and accounts. Then I must jump through hoops. "For account security" is what they say. "Use Paypal" or "use Google Chrome and no VPN" is the advice. Fuck you, I'll take my business elsewhere.

The whole fiat system in this surveillance state feels designed ensure we can't transact without banks and govt entities knowing everything "for our safety and security".