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also if I got my own gTLD, and put the TXT record at the tld level (which should be possible as far as I know), would bsky let me take a single word handle?

No, according to current Handle Specification: "bare" top-level domains are not allowed as handles, even if valid "hostnames" and "DNS names." (atproto.com/specs/handle)

they should update the spec to allow it, you never know if the people managing ai want to make a bsky account