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> Another reason might be domain trust? If spammers use omg.lol subdomains the entire thing might be blacklisted for email.

I think that them being on the https://wiki.mozilla.org/Public_Suffix_List makes that unlikely. (a Public Suffix is a thing like .co.uk — would it make sense to blacklist .co.uk? Not unless you're the type of postmaster who is willing to blacklist entire TLDs like .biz as well.)

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Ok I didn't know about this list. Feel like I should have known! I always though it was up to countries and top-level operators. I imagined something like .uk publishing somehow that .co.uk is a top level domain, for example.

I think the requirements to run a top level domain, like .lol itself are pretty onerous? But I wonder if it is easier to get your subdomain added to the public suffix list, and I wonder what legal guarantees are afforded to someone who registers such a domain.

There's no legal protections. Anyone can apply to be on the PSL.

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