It's a library written by some devs who thought it might be useful to others, too, and/or are proud enough to share their work. It's not that they'll publish it in an SEC filing.

For every n-th solution in the market, n-1 existing ones could have been used, but they weren't for (many times) good reasons.

And looking at their Makefile and pyproject.toml I can see that they knew what they wanted.