You can "login with GitHub" on GitLab, and the minimum you can do for an open source project that is given to you for free is to make a tiny bit of effort to respect the maintainer choice. Really I assure it's _that_ easy, even I did it a few days ago.
If you are not capable of clicking on three button to login on a platform and say "thanks" to a maintainer on an issue that is already there, but have the time and energy to complain on HN, I'm not sure I would want you as a user.
That's truly odd, why?
Edit: thank you for your perspective.