Often I'm lazy and just black out revealing information, like I did in my blog post about how British Gas can't understand my name (https://danq.me/it-is-only-q).

But sometimes I've done the same thing in other places and gone further, sometimes concealing "fun" messages. In my post about Halifax putting the wrong names on a letter to me (https://danq.me/halifax-dun-goofed), I changed my address to a message along the lines of "what, you think I'd put my actual address here, like it's my first day on the Internet" and then blurred that.

Incidentally, I think that one was the first times that anybody contacted me to say that they'd noticed the unblurrability of my images, but I've been using this approach for years!