How's it going to break anything? I just created one...
tentententen.ipq.co. 86400 IN A 10.10.10.10
so...now I can use tentententen.ipq.co as a name that resolves to 10.10.10.10...assuming I trust ipq.co to keep that A record and not delete or change it at some point. Other than the fact that you can't change it[1], how is this any different (other than being less useful) or scarier than DynDNS?
1. EMAIL ADDRESS
optional, but will allow you to update the record later (once we implement it)