Comment by cortesoft

I haven't fully looked into it, but it seems to me that this is basically a hosted version of Acme-dns (https://github.com/joohoi/acme-dns)

The point of acme-dns is for people who 1) need to use DNS validation because they don't have an externally accessible web server or need a wildcard cert and 2) either use DNS providers that don't provide API support or whose API support has not been integrated into their tool of choice like cert-manager or certbot.

I have had to use ACME-DNS for that reason, and I don't think it is a horrible business to try to offer that as a service. I don't think I would use it (since acme-dns isn't that hard to set up and I am familiar with it), but I could imagine other people might want to.