You can and you should contribute - Open Street Map
Today I found out that it's actually a lot easier to contribute to Open Street Map than I thought. There are some serious gaps in house addresses in my area and I was painstakingly using the built in browser editor in the browser.
But, you can use a FOSS app (available on fdroid) called StreetComplete that makes it a lot easier to help out filling in the gaps in your local map data.
It's really fun - kind of like Pokémon Go but you are actually making an impact 😁
Meanwhile Google maps has not got the shed and has the entirety of my property about 10 ft east of its actual location. Essentially terraced up to a neighbouring property even though it's not connected to that property and there is an alleyway.
But I suppose I could say that doesn't really matter for street navigation, which is what Google maps is actually for.
Naaah mate... it can matter a lot lol. We have a road closure (for the past few months) in our neighborhood. Google maps still hasn't updated it. I routinely see drivers driving up to it and getting annoyed for having to turn back. This wouldn't have happened had they used OSM tho!