For questions asking the community to recommend a particular license that meets criteria provided by the future licensor. Any question that seeks to have an open license is allowed, even if the criteria would render it impossible. Questions that ask for proprietary licenses explicitly are off-topic.
License Recommendations are a unique genre of question where the community is asked to recommend a license that suits the author/licensor best depending on the criteria they provide.
More information on effectively writing a license recommendation can effectively be found at the community meta post: How do I ask for a license recommendation?