I have a problem with writing text that doesn't read negative or angry, so a little disclaimer beforehand: it's not :D

I see your point, I don't tell them to change or not to embrace open source.

I like open source for various reasons (especially for learning), but not everything I use has to be open source by default.

I also understand the reasoning behind apps like Sync to remain private (non-paying user btw). If you put so much effort into a project you can go two routes: release it public or keep it closed and try to monetize it. When I use an open source app extensively and it brings value to my workflow or makes my daily tasks easier I'll throw a few bucks their way (or a server license once), but how many really do that? If you release your app publicly with the option to pay or to see ads to, some people could just fork it and re-release it, stripped of both monetization models that were intended as support for the developer. (Again, from the point of view of a developer that wants to see some return for their investment of time.)

In my point of view we have the benefit of an open platform (unlike reddit). If any dev of a proprietary client fs up, you can change it without repercussions. Unless all instances suddenly decide to restrict API access or make their API pay-to-use all at once, we won't see a shhow like with Reddit.

Sometimes I want something that works as expected and gives me a pleasant/polished experience when using it.

Forgive my exaggeration, but I usually don't use my free time to look through the code of every program I want to use, at some point we reach that "I've read the TOS" problem", feels like no one even reads that anymore.