Building software takes time and resources. Experienced show that most open source projects do not make enough money to make the resource investment worthwhile, much less the time investment.
I generally like people being able to out food on the table, and if that means I have to pay for their software to use it or get updates, then I am happy to do so if that software is of value for me.
That of course doesn‘t mean I appreciate unnecessary vendor lock in, hostile subscription models, etc. All of these things are common with proprietary software, but they are not inherent to it.
Obsidian is a great example. Easy to takeout open formats, generous licensing model and no aggressive licensing implementation that makes it impossible to use the software offline. The team behind it seems to be able to make a living and people can still feel safe about the access to their notes.
Even if its not open source, it would be great progress if we‘ve had more software like obsidian