It does not bother me so much, but the plunderer doesn't know who he is plundering in Mine too, there is no indication to whom that mine belongs to, only by the type of ninjas/lineup you can tell if you are very familiar with some player lineups, otherwise it's unknown, and only the plundered person knows who plundered his mine.

There should be two things implemented, including your suggestion, which is not a big deal since you can skip a mine if you do not like it or seems too powerful for you, and the other suggestion of giving the name of the mine you are plundering, like, to whom it belongs.