Sometimes you get into skill issue, or time issues. I make some softwares that I need, but I don't have advertising skills to make people use it.

And sometimes I want to make something, but I don't have the necessary skills.

For example I'd like a local filesharing option. Where a single folder would be synced in my phone from home computer when I'm at home, and from work computer and phone when I'm at work. Without using cloud sync between them only when I'm physically traveling between them, that's good enough for most use cases of cloud sync that I want for work.