Hi Ben,
Their admin also can’t seem to de-activate it. I also tried to de-activate it several times when I was at the company but for some reason it wouldn’t do so. I kept asking the Hubspot team (and still do) but no-one seems to be able to do so.
I posted the link on various blogs/websites and several people I was connected with also posted it in numerous places so I’m not able to track all the place it is posted. If I know the link was permanent and that Hubspot wouldn’t be open to de-activating/de-publishing/deleting the link then I wouldn’t have used it in the first place