On the other hand. Consider a prominent member one of the biggest open source projects leaves the project, joins Microsoft, and praises Microsoft and pushes semi-closed Microsoft technologies on every project, claiming Linux is dead without Microsoft, and we need to compromise by allowing these non-free technologies and porting almost everything to it.
All is done when Microsoft tried to copy LibreOffice (then OpenOffice) formats, created OOXML family of semi-open formats, and push them as ISO standards to bolster their file formats to kill other office applications for good.
DeIcaza (knowingly or unknowingly) was a part of an concentrated and coordinated effort to EEE Linux, and the open frameworks around it.
I never used and won't use any Mono based application in my personal systems and servers I solely install and manage.
On the other hand, VSCode is not free or open source. This makes it null and void in my radar, because I want my whole toolchain to be open and free, because when I left a project alone, someone should be able to get the whole toolchain and continue development. I don't like the idea of source code being locked in a proprietary development environment and hence suffocated on a whim with a choice of an external party.