I purchased CCleaner Professional Plus in 2014 as a one-time lifetime purchase. None of the documents showed any experation date field. Future updates were included. Now suddenly the program says my licence has expired and I have to pay a yearly subscription. I prefer to die before paying any more.
When Avast acquired AVG, AVG started to show publicity pop ups, several times a day, even while I was having a professional, paid, licence. I fought with them for more then a year, many others did the same, but the problem never got solved. In fact the company ignored all complaints. AVG ended being that malware they were supposed to combat. So I installed stopped using AVG.
Now that Avast has acquired Piriform, the same thing start to happen with CCleaner. I get popups while working.
Well, most of the features I needed from the CCleaner suite 5 years ago, are now available in the Windows operating systems and in other software I have. If CCleaner continues to be annoying, it will not be a difficult decision to remove it. Still I think what Avast is doing is illegal and immoral, and I will - lifetime and for free - give my opinion on them every time I see their name appear.