[anderspitman]

Not sure, but I think maybe it already works the way you're suggesting? The free subdomains hang off the takingnames.live domain. takingnames.io is only used for the website currently, because I'm concerned about it's reputation. Free subdomains are often used for spam/phishing.

The public suffix list is a great suggestion; thanks!

[hsx]

Oh, I hadn't noticed that difference! In that case it already works the way I suggested.