MFreburg

Why this pop-up all of the sudden, why now?

I've been a Ccleaner user for many years. Today for the first time ever I got a pop-up (I hate pop-ups) saying "thanks for playing fair. The free version of Ccleaner is for private use only. If you are a commercial user you must use the paid version," or words to that effect. What on earth led the software to conclude that I am a business?!