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 end