He corresponded with his previous employer regarding a free project that competes with them. When he got a negative response he then decided to air his dirty laundry on the Internet.
It matters in that it gives us a sense of what the norms are.
repl.it's differentiator isn't just being a repl that can run different languages, it hardly competes directly with them.
> When he got a negative response
when he got threatened to be sued* he posted about it, I see no reason why doing so is somehow bad form while threatening to sue is not bad form.
Calling out hypocrisy absolutely matters. It matters a lot.
In this case, it also provides a very important precedent.