Fully true, the point is having a simple to remember way for any place on earth to find your place back. https://whenwhere.cf is a fully open source webapp written by me that runs on IPFS so it doesn't even reach any of my servers, it doesn't send anything to any server and gives you the plus code of your current location and enables you to navigate pluscodes. I created this so people don't depend on Google. That said, Google did invent this system (for completely free usage by everyone, all related source code is APL and the code system itself doesn't have any form of encumberment). At this point only openstreetmap.org didn't implement the codes (derived systems do, e.g. OSMAnd and Mapy.cz both use OSM maps) and you can find on my Github some bookmarklets that remedy this for the OSM website. If you know your location you can even calculate plus codes by hand.

The Plus Code system is meant for places without clear and simple to use street names and house numbers, as is still the case in a surprisingly huge part of the world. I have written about them before. The idea is that you can easily communicate your location to enable e.g. logistics, emergency services etc where to this date communication of your location is very hard. As many people use Google Maps, giving this code immediately on the "Where are you?" screen is very useful.