We have had questions related to this matter here on Meta before (there are probably more that I just don't recall right now). When we added the custom close reason dealing with specifying a relevant jurisdiction for legal questions, it unfortunately removed the possiblity of choosing a generic "this is not about amateur radio" close and flag reason. That can at best be described as an oversight on the part of us moderators at the time.
The site has also now had some time to grow and find its scope, and we have seen examples of different kinds of close-worthy questions.
Let's have an open discussion here. What close reasons do we want or need in addition to those provided by the Stack Exchange network software itself? That is, what options do we want under close -> "Off-topic" and flag -> "Off-topic", aside from migration to another site and custom flag/close reason? If examples of questions that you feel would fit the proposed close reasons exist on the site, it may be worthwhile linking to them as well as examples.
One close reason per answer; please make your answers Community Wiki to lower the bar to improving the suggested close reason texts; and let's see what the community thinks.
Please try to make the suggested close reason texts actionable by a poster. If someone's question is put on hold or closed because of one of these reasons, it should be as clear as possible what they can do to make the question eligible for reopening. We can always reference meta posts elaborating on the reasoning behind the close reason, should a reasonable-length text not suffice.