One of the most interesting insights about this I've read so thanks for the content. The overarching take from it seems to be that all clubs have and are doing it and nobody has wanted to or bothered to police it so a blind eye is turned. This begs the question as to why Boro have suddenly decided to take the action they have and I'm not sure of the answer. The only thing that springs to mind is that they saw it as a chance to get us on the back foot in the lead up to this game and create a narrative that they've fueled so that it gathered momentum. Might be well off the mark but if what's posted by SaintlyAnd is true they certainly seem to have gone left field on it but for what reason?
It also begs the question, have Boro themselves been at it and is there any evidence on them?