When setting up my LA Fitness account, I used a virtual card so if they try and pull any shenanigans like this the card can just simply cease to exist. Many credit cards offer this as a feature, and if not, privacy.com does this as well
Are you able to print in PETG at all, or is it just this one specifically that gives you issues?
I don’t think you need to get that fancy with it, I’ve had success with a similar strategy of cooking the burgers as normal, then placing slices of cheese on them with rhe door slightly ajar, and letting them melt with the residule heat
In airplane mode and even while turned off, phones have been known to still transmit data via background services. Leaving it behind, or a Faraday bag are the only assured options I’m aware of
Also notable that GamersNexus is doing the same