I read “the last straw” as being the final bad decision among many (which I think is what the idiom means). A tipping point. Usually you can’t remove “the last straw” to fix the camel’s back.
If the linking policy was the sole issue I think that tweet didn’t convey his meaning. However, I actually think that, like many people, he returned despite some remaining issues he had.
Also, I get it, social media is made to be addictive. Even more so when you have a following. My original point was that I think moving through a long chain of alternatives on moral grounds is not a common pattern.
