In the advertising bit they say what data they use and it’s all broad stuff like device type and location, as well as aggregate data on how many people click on the ads. Of course, you can just disable this, which surely most people do - tbh I forgot there was even this “sponsored content” there at all (it was added a while ago I think).

They don’t say that your browsing habits, interactions or communications are used for anything besides doing what’s required to actually do what you asked.