Or maybe because it’s good? Have you tried the Occam’s Razor thing? You need to realize that by and large, users could not possibly care any less about source code available if you gave them money for it.
And the software has upsides. Compared to NewPipe (what I had before):
Updates in finite time after Youtube breaks something.
Can actually log in with your youtube account, directly accessing your subscriptions and so on, instead of having go through the complicated export/unzip/import process every time you change your subscriptions and want to resync them.
Includes more sources, and pretty heterogenuous ones at that. Nice all-in-one app.
And keep in mind, nobody who is not a gnu cares whether for some hyper-specific context that this post is not in, “free” can mean the sourcecode is freely available. The english language already uses the word “free” in everyday parlour, and if you use english, you know those uses. One of which being “costs you nothing”. Trying to argue around that just makes people less likely to care about source code availability because frankly, you’re being a dick to people for no bloody reason.