Have you considered uploading IC2Classic to Modrinth aswell?

As long as it is not on Modrinth or not marked with won't fix, then I believe this issue should remain open.

Ping me in case it gets uploaded to Modrinth.

I considered a few of my mods for modrinth.
IC2Classic wasn't one of them since i have to get permission to release it somewhere else then curseforge.
Honestly not sure about it.

At the moment this is a no from my side.
But this can change in the future.