This is very much a philosophical question and I doubt we will resolve it here on HN. However if you want to deem this act malicious I beg you to ask your self: To whom is the malice directed towards, who was harmed the most? What does this act tell us about the industry?
I, on the other hand, see this sabotage as a clear act of love from a fellow worker.
I would also strongly question any “fellow worker” explanation since I'm sure the pain will almost universally be felt by the “fellow workers” who have to update things, reassure their security team, or increasingly start justifying their use of open source software.
It certainly wasn't directed at the large corporations, they have many systems in place to mitigate this type of attack. It was directed at everyone else, like fellow open source devs, contractors, hobby developers, students, and small to medium businesses.
The goal simply appears to be chaos and attention.
No, because that did not impair use of those libraries whereas this change deliberately broke every program written by someone who trusted him and used his code under the social contract he offered.
Open source maintainer funding and burnout are real problems but betrayal won't make things better. Imagine if you lived in a house with a bunch of roommates who weren't doing their share of the housework — you're entirely within your rights to stop volunteering to clean the toilet but it's crossing a line if you instead modify it to flush up.