The license is the license. I don't know what you expect. I think, to be a good sport, they ought to mention in an About page that they're forked from Alacritty, with a clear link and thank you/appreciation note for the foundation code, but anything beyond that is both unnecessary and should not ever be expected.

(Side note but I find it odd how anti-corporate and anti-AI HN has become starting in the past decade. I am very much not right-wing and frankly I loathe rightists, but I am also very much not a socialist. Though I'm not a libertarian either, to be clear; I just don't have an instinctive revulsion towards corporations who use open source code - or corporations who have more restrictive licenses to prevent this very thing, like Elasticsearch or MongoDB - or towards AI companies for training on public things, or really towards corporations in general. I am perhaps the rare left-leaning corporate shill.)