Yet we also talk about players abusing their, or, perhaps more commonly, their opponent's lack of, mobility on open maps.Eh, the problem with endorsing the use in some situations is that in neither case is it considered market abuse, as you're using the market for its intended purpose and at no point abusing it and/or its function(s).
It's like saying you're abusing archers by using them to shoot over woodlines.
Language is shaped by the context and frequency of its use. I would suggest that the meaning of 'abuse' has transitioned beyond what you wish here. By all means encourage a different use of language, but simply sitting here saying that people are using the terminology wrong when the colloquial use has evolved in this way doesn't really accomplish anything and fails to reflect the collective influence on language use.