People are worried about the user-generated content, but what about the proprietary software that it was built on or the OS it is running on. Companies like Google and Microsoft has been data mining for years and we do not know, where this data ends up and what government sanctioned projects have been going on behind closed doors.
You have no privacy and your data is being collected without your consent, whether you like it or not. Deal with it.
if you are looking for better privacy there is always solutions for that. for example you can stop using windows, especially windows 10 which has built in Microsoft made keylogger for snooping around and collecting data.