From the Register...
"According to people familiar with the matter, Bogensberger was asked to leave by the company's board of directors." [0]
For more context...from Jonathan Cowperthwait, NPM's former vice president of marketing...
"Many of us spent the last year watching our friends and colleagues' struggle through our fingers, but I'm still profoundly confident in the company's ability to turn this around. Sometimes bad executives happen to a good company." [1]
[0] https://www.theregister.co.uk/2019/09/20/npm_ceo_bryan_bogen...
[1] https://www.businessinsider.com/npm-ceo-bryan-bogensberger-r...