I use a computer a lot, and I have an expensive keyboard and mouse. I'm the target market in a sense; if there was a compelling enough upgrade to either, I'd probably buy it.
I can't imagine what software features they could possibly offer that would qualify, doubly so as a subscription. I picked my mouse because it has lots of buttons, a responsive sensor, low-latency wireless, and it runs on a standardized replaceable battery. It would be hard to improve any of that with software.
It isn't random. They search phones belonging to people they suspect of crimes, but don't have enough evidence to get a warrant for, people they think are connected to criminals even if they are not criminals themselves, and people they want to harass such as activists.