Why I am no longer active on SE: https://meta.stackexchange.com/a/342950/162102
Why I am no longer a moderator: Stack Overflow Inc., sinat chinam, and the goat for Azazel. See also this call for action and/or the GoFundMe campaign to pay for legal costs.
Some things I helped make:
Mi Yodeya publications: https://s.tk/miyodeya
Stack Exchange Data Explorer tutorial: https://data.stackexchange.com/tutorial
Worldbuilding blog (Universe Factory): https://medium.com/universe-factory