Not for general use, I used the ASUS service for a few years back when I had an ASUS router. The good thing about using the paid service with Afraid that I'm on now is that I can use my own domain name. I also use Afraid's nameservers which means I can do all my records with them too allowing me to use certain subdomains for Google services and others for multiple redirections. For example...
www.clanlawrence.co.uk goes to my home hosted website (Nothing on it yet btw)
radar.clanlawrence.co.uk goes to my home hosted ADS-B server
mail.clanlawrence.co.uk goes to Gmail
nextcloud.clanlawrence.co.uk goes to my home hosted Nextcloud server
dad.clanlawrence.co.uk goes to my dads house so I can remotely fix his computer, lol.
My router automatically updates the records that are pointing to my home network and my dad's router updates his IP with the record pointing there. Plenty of scope for expansion too.
Sweet baby Jesus.... I'm sold. Moving out of the parents' house soon so the dad. one sounds ideal, fascinating idea.
Out of interest, why the Gmail one? Only one I can't understand!