This isn't about just moderators. There are a lot of people that are moving on simply because of the implication of having to use Reddit's own app. It's not out of spite like you seem to be painting this as, it's because Reddit has historically made terrible software and have relied on the very same people that gives them most of their value to even make "their" content browsable.
And no, spez isn't the only person putting his name next to his arguments - the Apollo developer he defamed also was.
They've been user hostile for a very very long time. This isn't just about 3rd party apps profiting. This is the culmination of ignoring the user until they want to profit off of them. Shocker they aren't seeing eye to eye this time, time 1000th.