The software they used was the difficulty slider from South Park: The Fractured But Whole.

I wonder is OP the one selling them? 🤔

EDIT: Turns out that OP is the one selling them.

AirVPN allow port forwarding.

I use Mullvad for my day to day devices like my phone and laptop, and AirVPN in my homelab for things like torrenting.

On Graphene OS there is a duress pin you can set which will wipe the phone immediately if it’s entered. Although I haven’t been able to get it to work in a way that i could open different profiles automatically by entering a different pin/fingerprint.

BUT.

My old Xiaomi Mi Mix 3 phone could do it. The phone had a “secure space” which was a separate environment with its own apps. I could assign different unlock fingerprints to it. So one finger would open the default environment and the other finger would open the “secure space”, and it worked seamlessly without any delays in unlocking.

I wouldn’t choose Xiaomi for privacy obviously but it’s just an example that shows it’s possible.