This app was mentioned in 5 comments, with an average of 8.20 upvotes
I understand not wanting to share things with personally identifiable information. Not trying to push you to share something you don't want to, but you could use an app like this to block out license plates, house numbers, etc.
If you could take pictures you're comfortable sharing, I'd be interested in seeing the effect your talking about.
Pixelot: https://play.google.com/store/apps/details?id=com.bybeardy.pixelot
I like more to blur things than paint over then but for that I use Instagram Stories and save the edited photo lol
I use Pixelot. Has both blur and pixelate options (and looks better/nicer than simply splotching paint over it).