Atom still had a healthy number of active contributors (presumably most of them were from GitHub) making improvements to the product on a daily basis to make it a perfectly viable tool for the people who chose to use it (and despite the much smaller developer base they continued to innovate with projects like xray and tree-sitter)... That is until the Microsoft acquisition happened.
Before anyone jumps in with the causation vs correlation argument, I think any reasonable person looking at the evidence would agree that the timing is convenient enough to make it highly unlikely to have been a coincidence, especially considering that most of those contributions were from employees at GitHub who were _getting paid to work on Atom_, so the only reasonable explanation for the contributions to stop abruptly within a month is that they _stopped getting paid to work on Atom_.
To add insult to injury they even had the audacity to claim they wouldn't do exactly what they did. That is the crux of my issue with how they handled this acquisition.