A Vendor Lock-In is when certain software is developed to be incompatible by design with other software that have similar functionality. It is used to establish a monopoly. And any such function is malicious.
This comment thread is for people to document various implementations of this malicious feature.
There is a war now. You could call it the Third World War. One front is in Ukraine, a country I was born in. The other is in Israel, the country I live in right now. The war is between Freedom and Dictatorship. Ukraine wasn't necessarily the most free of countries, but it was very trying to become one. And when it started to resemble a good Free Country, Russia decided that it doesn't like it and attacked it. Putin is a dictator of Russia. And a Free County near by is not something Putin wants.