Isn't there an alternative to MaxMind?
Seems like a problem if they're the only useful source and they can change their license/fee to anything they want at any time.
In most cases, their database is entirely free as in free beer. You can't modify and contribute back to it, though (for somewhat obvious reasons). You can download a free local copy and purchase a more advanced version with more information. But if you need a simple lookup, the database is free, excellent, and is updated twice a week.
https://dev.maxmind.com/geoip/geolite2-free-geolocation-data