Re: The sub 250g models, the lack of information in published regulations on these is because they are functionally not regulated in the same way, beyond the usual prohibitions on violating restricted airspace, and various other common sense things.
You do not need to register a sub-250g drone. You do not need a license. It does not need to be labeled, and as of yet it does not need to broadcast a remote ID, either. These can be flown under the "Exception for Limited Recreational Operations".
That is:
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Fly only for recreational purposes (Specifically, this excludes any commercial activity at all, whatsoever. That means that, no, you cannot take drone videos or photography for anyone for money, you cannot do roof inspections except I guess of your own roof, you cannot post and subsequently monetize a youtube video of your drone footage, you cannot use your drone for any money making or commercial enterprise in any capacity, nor use it to provide a service for someone else, even for for free.)
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Keep your unmanned aircraft within your visual line-of-sight or within the visual line of sight of a visual observer who is co-located and in direct communication with you
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Do not fly above 400 feet in uncontrolled (Class G) airspace
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Do not fly in controlled airspace without an FAA authorization
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Follow all FAA airspace restrictions, including special security instructions and temporary flight restrictions
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Never fly near other aircraft
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Always give way to all other aircraft
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Never fly over groups of people, public events, or stadiums full of people
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Never fly near emergency response activities
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Never fly under the influence of drugs or alcohol
You can read the whole shebang at the link I provided. Note that the details of this are subject to change in the future, but for now that's how it is. Pragmatically, no one has ever bothered me or my drone -- license or not.