I can add something to this: other people sensitive data.
If you a doctor and you have your private patients data legitimately copied with some of your PC application that have an access to your files and then such application hacked and all your patients private data gone to some hacker then you in trouble and it yours medical reputation will be ruined as well as an application owners one. Well, maybe it will be just yours reputation if you can remember “the fapenning”. Apple had not all their users abandon iCloud completely after this hack, you know.
So privacy keeping is basically good for you even if you personally have nothing to hide.