@terdononstrike (or any other moderator): I just received three very similar answers to an obviously obsolete question of mine. See here:
askubuntu.com/a/1474116 All are from new users. I've seen a similar thing on Mathematica.StackExchange. New users post superficially helpful, but trivial answers, then a couple of days later replace the text with spam. Not saying that this will happen here, but it's suspicious.