Though unfortunately Subscriptions in software today are the norm, they are a malicious functionality. Any software that you already have installed should work whenever you want it to work. Having a timer implemented in it, so it will refuse to work, unless you pay every once in a while, is malicious.
This comment thread is for people to document various implementations of this malicious feature.
I definitely hate subscriptions...but they are certainly a valid choice for some products, like mobile data, or streaming services. But for software like password managers, or microsoft office (although i think they do provide a lifetime purchase), doing subcriptions exclusively is a rip off, especially if they are products that you don't use off and on.
Digital Restrictions Management or DRM is any software functionality that is designed to prevent you from using the files on your computer the way you want to use those files. This is obviously a malicious feature. And is defective by design.