Multiple translations have all the right to exists.
Official has it's own quirks, so why not.
As long you are having fun in the end, thanks for translation!
I mean if we‘re perfectly honest, all fan scanlations are illegal. So no, they literally do, in fact,
NOT have the right to exist, unless they bought the license by the Japanese publisher.
But I get what you mean. Still, official translations are perfectly fine in 99% of cases. Only exceptions would be something like EHS‘s scanlation of Golden Kamuy where they had a page at the end of every chapter with background knowledge (it‘s a manga with many references to history) and easter eggs. It significantly improved the reading experience and the official version doesn‘t have that.
Anyway. the translator wrote they have no other manga they want to scanlate, so… whatever.