[SmallDeadGuy]

It doesn't, monitoring and configuring battery saving is relatively harmless to the majority of consumers. The point that the OP made is that there is nothing stopping them from doing more harmful tests like experimenting with web traffic, running benchmarks or something, tracking app usage in terms of direct relationships (e.g. this person always reads emails, then hacker news, then checks snapchat, then browses these kinds of shopping apps), etc. I'm not saying that these are likely, but when information about specific users drives ad revenue up then it's not much of a leap to suggest they'll collect a bunch of information that people don't want them to collect.