Interesting, apart from the problem that like any Google feature/product it will likely be abandoned, and then shut down in a few years screwing over anyone that actually depended on it :smh:
Plus Codes (or Open Location Codes) are simply mappings from latitude/longitude to an alphanumeric string [1], and there are open-source implementations in many languages [2], which means the effect of the project being abandoned would be limited.
[1] https://github.com/google/open-location-code/blob/master/doc...
[2] https://github.com/google/open-location-code