Why in the world I've to change my access point to opt out of google's data collection? Why are they collecting information in the first place? Stop collecting

Why in the world I've to change my access point to opt out of google's data collection? Why are they collecting information in the first place? Stop collecting information. This is way beyond anything but privacy intrusion. It's like telling another some big corporation that one has to change the name else they will profile you irrespective of what you do... Atrocious isn't? Publicly available information doesn't mean that you will whatever you want with it. Tomorrow, (already their OS, Android is doing it), they will collect everything about a person and this is going way beyond who has signed up for. This needs to stop. All in the name of providing services or improving lives of people. Who cares about the dark side? How much profiling has gone into the collected data? What kind of risks it may pose in the future? This needs to stop... the sooner the better... Everyone has the right to be private. It doesn't mean one has to throw away everything in public about them. Isn't? I know I might start another discussion thread, but I'm sure there will be people who will battle for and against... But it doesn't matter...