I don't know how frequently this happens, but my experience is that a link to a lemmy group was deleted by mods. It was very politely worded, and suggested and alternative community on Lemmy, and also noted that there's no reason that somebody couldn't read both communities. It was still deleted as "spam or self-promotion."
That could just be a maturity issue with the mod who deleted it. It could also be that Reddit itself is doing it and simply said it was done by the mods of the group.
Same. I bought a 4-pack of toner refills with it. I'm on the 2nd one.