Depending on the product, this model could be problematic - should you provide ongoing security updates beyond the paid period? If no, then a big chunk of your

Depending on the product, this model could be problematic - should you provide ongoing security updates beyond the paid period? If no, then a big chunk of your installbase is going to be insecure. Some people might feel that's unethical, or too much of a bad press worry. If yes, then you need to patch a growing number of branches with libaries that might make breaking changes requiring re-writes in your code. I guess Microsoft ran into this problem when the End Of Lifed windows XP. That said, for someone who just has an app they are writing and wants to make a little money, it's probably overthinking.