Do I need to reference MaxMind when using their GeoIP database (GeoLite2)?

Question

Licenses for software and other works

The description of the free MaxMind GeoLite2 base says that you need to include a link to MaxMind in the project that uses it.

License
The GeoLite2 end-user license agreement, which incorporates components of the Creative Commons Attribution-ShareAlike 4.0 Intern... can be found here . The attribution requirement may be met by including the following in all advertising and documentation mentioning features of or use of this database:

Who has used GeoIP, is this a must?

If so, what other free databases can you recommend?

Answer 1

sypexgeo.net/ru/download does not require a link

Answer 2

There are no such bases in PD (well, where it would not be necessary to indicate the source).