I've learned that folks end up unintentionally installing software which acts as essentially "proxy server as a service". I've heard of browser extensions doing

I've learned that folks end up unintentionally installing software which acts as essentially "proxy server as a service". I've heard of browser extensions doing this, but I would be unsurprised if mobile apps did it. Every holiday I do a sweep of my parents' devices to make sure they haven't installed anything silly (my mom somehow always has three or four different weather apps). I'd suggest giving it a look the next time you can.