I just posted a new topic, having overlooked this one but it's basically about the same thing, just with some details regarding phone activity I just heard today at 14.230. But I thought I'd reply here that contests tend to mean that the voluntary band plan is out the window, and certain activities that are ordinarily absent from certain frequencies will be there during contests. For example I think FT8 was happening on at least two frequencies rather than one per band during Field Day in June.
That said, I agree that people should respect the band plan as much as possible, but some people just believe that they're entitled to do whatever they feel like, if it's technically allowed.