Much more important is who starred it. And are they selective about giving out stars or bookmarking everything. Forks is a closer signal to usage than stargazing.

Indeed, GitHub should set up a monthly quota for available stars to give and correlate the account age with it: either make something up like a "trusted-age-factor" that multiplies any given star by that factor, or scale the available quota accordingly by that factor (and let users star repos repeatedly).

GitHub should also introduce a way to bookmark a repo, additional to the existing options of sponsor/watch/fork/star-ing it.