Can anybody share some context, as to why this person is resigning?
Twitter is on fire with passionate debates on both sides of the issue. Lots of people asked the board to resign in protest lest they be deemed supporters of RMS, and now we're seeing the board members react publicly.
But the main controversy in the FSF right now is the reinstatement of Richard Stallman.
Here's an article about the events that led to Stallman's resignation in 2019: [1]
He has also been known to, for example, hand out "Fuck Me" cards to women he deems attractive at software conferences.
[1] https://arstechnica.com/tech-policy/2019/09/richard-stallman...
https://pbs.twimg.com/media/EEWlJXRWsAASHJw?format=jpg&name=...