Colouring an area red because they don't have DNSSEC enabled on a domain seems excessive.
A nice addition would be to add who is hosting their email. First handful I've looked at are all outlook.com, which seems a much bigger privacy & security risk than not using DNSSEC.
Not making it red would downplay the "SEC" part in DNSSEC.
We already have some privacy metrics in addition to tracking cookies, and there will be more. All are important at the same time.
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> A nice addition would be to add who is hosting their email.
Something like this? https://livenson.github.io/mxmap/
A few countries have those, here's a Github repo of the Swiss one (has a list of forks in there too): https://github.com/davidhuser/mxmap