> It also sounds like they were charging for DNS resolution before? Or is it DNS hosting?

High end DNS hosting is often billed around the number of queries, number of zones, and number of records, number of special names with fancy features, etc. If you're switching from other DNS hosting, you might not even know what the query volume is, so that's kind of exciting when you need to make a switch.

If you were paying per query and the cost was too high, raising TTLs and consolidating services onto fewer hostnames are pretty achievable ways to reduce the query volume, so it is something you have some control over.