I would like to write code for latexml to translate a package but I found the documentation to be hard to understand. That might be what is holding developers back. I looked at this a year ago and gave up.
Nah. I don't do subscriptions for much of anything. I just do fewer searches now that I know google is so heavily slanted toward commercially relevant queries.
Kagi seems like an obvious acquisition target. They will never raise enough paying subscribers.