Many of these are either archaic or as part of the standalone phrase “ill-gotten”. Nobody is saying that it wasn’t used in the 18th and 19th centuries.
I hear all the people who report common contemporary use of “gotten” by people in various parts of the British Isles. Nonetheless I stand by my observation that it is becoming more widespread amongst people from areas where it was not used (this includes the part of the Central Belt of Scotland where I grew up).
I believe that people are picking it up not from hanging out with fellow Brits who use it in their areas, or Irish people, but from US media. My own son is an example of this-never hears it from parents or school but he does throw it into a sentence now and again.
Ironically, given how bad-natured this discussion became, I don’t actually mind “gotten” all that much. It’s not in the league of diaper (or stroller, which I don’t think has been mentioned yet). However if I see “gotten” in writing I would consider that a very strong flag that the writer is American. I don’t even mind Americanisms in general, but I do think it’s important that those non-Americans who use them do so knowingly.
As for whether pedants’ corner is a place for general discussions about the evolution of language, I disagree. The whole point of the creation of the board (I was there when it happened) was to create a “safe space” for people who were derailing threads in other places with criticisms of SpaG and vocabulary choice. “Pedant” has negative connotations and those who self-define as pedants tend to be doing so in the full knowledge that their views are going to rub more tolerant people up the wrong way. The idea of having a corner was to create a self-indulgent echo chamber where such views could be freely expressed!
And no, that doesn’t mean that it is a racist and xenophobic free-for-all. It was intended to be lighthearted, with the observations limited to language only. Yes, I can see how some of those observations could be read as code for racist and anti-immigrant sentiment but I genuinely believe that the average user of this board does not have that intent.