This problem is already prevalent in steemit. People like to use irrelevant tags, especially the trending tags, in the hope to reach more users. This behaviour is always frowned upon by the steem community. Unfortunately, right now there is nothing we can do about it. Musing can perhaps come out with some rules that forbid these misuse, like not upvoting them, for example.
In steemit, some communities like the #kr will actually warn and even flag anyone who uses the tag and post in non-korean language. But in musing, it doesn't work because musing questions are comments in a steemit post, and there is no flagging in the musing.io interface.
I am sure the musing.io owners are aware of this problem and a solution should be planned. Let's wait for it.