As one example, the U.S. Federal Communications Commission uses it in its Broadband Data Collection program. You can see some of how it's been implemented here: https://broadbandmap.fcc.gov/
Edit: It seems some people get a blocked message when visiting the base url. The home path may work better? https://broadbandmap.fcc.gov/home
Building on this, although frequency allocation charts are aesthetically pleasing, they are cumbersome to use for research or determining what frequencies are allocated to what services. In practice, simple table formatting provides the easiest way look at allocations and compare country by country.
One main reason is that allocations are accompanied by footnotes that provide further clarification for how each frequency band can or should be used. For instance, footnote US334 states that the in the bands 17.8 GHz to 20.2 GHz, fixed-satellite services transmitting from space to earth via geostationary and non-geostationary satellites may be authorized on a primary basis. For people/companies looking to provide services, this is the difference between being able to operate in a band and not.
Additionally, it’s simply much more practical to look through and filter a table of allocations. As an example, this very simple site allows for easy comparison’s between the allocation tables of 25+ countries: https://spectrumdatabase.io/. It’s not as pretty, but it’s more practical.
Either way, it’s great to see people interested in frequency allocations!