You can get them for free from telegram or moded app stores.. if your stealing anyway there's no reason to pay someone $5 for it..
While your at it grab a YouTube premium also...
Im assuming those modded apps are just coded in a way to trick the software that you're a premium member.
This is slightly different you're taking other people's rightful subscription that they get from their phone company. Plus some sellers don't cancel it after 12months thereby charging the customers full price every month on their cell phone bill if they don't catch it