Any information on these stickers on signs should be reported to the council or relevant authorities.
Reminds me of the "Yes" stickers we saw in the failed takeover coup of scotland.
I roasted South Ayrshire and East Ayrshire councils who tried to pass me on to the likes of Amey Highways etc who they said were in control of roadside signs and maintenence.
I reported every "Yes" sticker i saw on signs and roundabouts, and said they were a distraction and distracted you from concentrating on your driving and watching others around you.
It was futile but i was happy in the fact i was roasting them about these silly wee stickers, while others took glee in slapping these failed takeover stickers on anything that didn't move.
They are trying hard to try and prove something, they are only making a fool of themselves, bitter barstarts.