You just made that up. There has been no prohibition of the word Blackboard, it happens that very few schools still have blackboards, but in fact the VLE which most schools and colleges use is actually called Blackboard and this has been unproblematic.
Many years ago i worked for a company making childrens easels, eg BLACKBOARDS, the ones in charge decided the use of the word Blackboard could be seen as derogatory, so i was sent a memo telling me in future they where to be called Chalk boards, a few weeks later got asked to manufacture some as a trial with a white faced side,eg white boards, and a chalk board side, i rewrote the memo and sent it back saying some people may find the use of the term Whiteboard offensive and they should be called Painting easels, never got any more work from them.
The same people decided all toys that children hit with a hammer or some other item would be banned from sale, no more hammer peg, or a few other toys.