Please Google!? Can you track me PLEASE?!!!? No thank you. I don't need them to share literally where I had my breakfast or took a walk to try to help people sell me nonsense I don't want.
Well, it's either or, but not both.
Either they use the data they have of you to sell relevant ads and be the best at targeting (which STRONGLY goes against selling your data for a quick buck) OR they sell the data and stop their VERY elaborate advertisement business.
You may mock me for saying this, but I think that Google can be trusted with data IN GENERAL as much as most other companies that you entrust some of your data.
How much, under which conditions, etc... is all up to you.
They are not perfect either, so that is a consideration, something can always leak, but I think that Google is one of the most dedicated companies out there in terms of infrastructure security.
Now, whether you even want that data to leave your devices is in a whole other book of course, but don't just assume that they will hit you both ways intentionally - ads and passing out your data.
Who they WILL give data to is governments, but guess what, if you're worried about that - and there are good reasons to for anyone - your devices themselves are not bullet-proof either.
If anything, you'll not get more things you don't want, but more you actually might care about the more relevant ads get. Extending on that, it takes much less advertisements once everything is a lot more refined.
That's why they have a sustainable ad model where they allow you to skip ads, etc... they are aware that either something is relevant or it's just an nuisance.
They force-play some ads, but compared to free TV YouTube for example is in a whole other league.
Glassed Silver:win