Comment by gitaarik

There are also people that prefer to use free / open-source software because of it giving power & control to the users & community, opposed to proprietary software where a single (typically commercial) company controls the software.

The disadvantage of propietary software is that you are at the mercy of how the company decides to maintain and develop their software. And they might do undesirable things towards their users. Like displaying adds, tracking / profiling their user's personal data. Changing the pricing. This typically happens when they gain enough market share and have enough users vedor-locked into their software.

And the vendor lock-in also makes it harder for users to make the software work with other 3rd party software. So generally propietary software isn't easy to combine with third party software, unless the company has a commercial incentive to support it. But often one of the reasons for the software to be propietary is because of the vendor lock-in. So that you will use all software from 1 company that all works well together, but doesn't work (as well) when trying to combine it with third party software.