[compsciphd]

one could just pay a small yearly fee to register their domain with google and get easy/unlimited ddns.

[vetinari]

You can also host your zone with Hurricane Electric and skip the part about paying a small yearly fee to Google.

[compsciphd]

there's no cost to google besides the registration fee, if it's your zone, you're paying that fee anyways. The only way to not pay a fee is to go through a free dyndns provider that you have to use a hostname off of their zone.

[vetinari]

Is the DNS free, even if you use other registrar than Google?

I have some domains with country-specific tlds, and I'm using small registrars there. he.net is free even in this case.

[shoelessone]

I don't believe this solves the issue if your IP changes all the time.

[dewey]

Why not? As OP said you'll get an easy way to update the dns entry with the new IP.