Depending on one company with all of your data is pretty risky. Even if we ignore the obvious privacy concerns of when some corporation knows everything about you... Just imagine what would happen to you personally, if one day that corporation would just... disappear for whatever reason. Say, Google gets a huge fine from the European Commission for one of their monopolistic practices or shitting on their users’ privacy, and turns out they don’t recover from that. How screwed are you?
One day you lose your emails, photos, passwords, documents, notes, calendar, what else?
So, recently I decided to diversify my technical dependencies. Not to boycott Google completely, but to at least use it less.