Not everyone even knows how to use custom ROMs, tech workers may have a huge presence online but we’re a tiny minority irl.
Anyway, good, go build it. Saying one small mistake makes a company terrible privacy isn’t doing a whole lot for your credibility though, so I recommend you spend more time building than talking about it.
Idk, I pay for my utilities based on usage, and there are fees too. The fees maybe could be argued are subscriptions, but they’re not the majority of the bill