It's another thing for its license to explicitly prohibit its use with any other IDE, even if it's API-compatible, even if it's literally exactly VSCode recompiled with another name.
And it's yet another thing to proactively insert checks for that.
Why? If I listed an app on the google play store but intentionally limited it from working when installed by alternative means (eg someone relisting it on an alternative app store without my permission) would that be problematic? Why is this different?
People want to be given everything for free, to be able to put the absolute least amount of effort into the code they write, in the name of “open source.”
True! Open source = free stuff for a lot of people. This is why corporations like Microsoft encourage open source - so they can profit off of other programmer's hard work, without giving anything in return in most cases, and in rare cases giving a small donation. So, it goes both ways.
But open source nevertheless contributes to the commons when done well.
It's another thing for its license to explicitly prohibit its use with any other IDE, even if it's API-compatible, even if it's literally exactly VSCode recompiled with another name.
And it's yet another thing to proactively insert checks for that.