Someone on a separate thread pointed out this is known as Havel's Greengrocer: the owner of a market feels obligated to display communist propaganda lest he be suspected of disloyalty to the party [0]. This is very similar to all the businesses suddenly issuing letters of support for Black Lives Matter, lest they be suspected of being racist.

[0]: https://en.wikipedia.org/wiki/The_Power_of_the_Powerless#Hav...