I have the Strip app on all my apple devices, a couple of which I gave away without deleting the app. Is tree a way to remotely remove or disable it… (like apple lets you erase a lost device)?
Before you give away any device, you should perform a full reset and erase before doing so. That is the only way to ensure all data is removed. It does not make sense that every app would have to implement this function separately.
If you are concerned for your data, use the Apple function to erase a lost device. It’s either that or talk to the person you gave it to. There is nothing else that can be done.