I think "very straightforward" is vastly overselling how easy editing OSM is.
It feels like editing a database, without any affordances for easily making common updates.
If the hours of a store are wrong on Google Maps, I just upload a photo of their store, and it'll be corrected quickly.
On OSM, well, most things are out of date. There's no simple 'update this business' flow, just a database editor. And a map that feels like I could break anything by clicking in the wrong spot.
OSM is a cool project, but it isn't straightforward. And unlike Google and Apple maps, most of the businesses in my area are years out of date, so I can't effectively use it to find information either, so I just don't have any reason to interact with it. Plus no aerial/satellite/streetview imagery, which I understand is probably infeasible, but ultimately it just means OSM is a niche product that won't replace Google.
So yeah, I'm propping up Google, but I get way more benefit out of it than having an open data set used to power Amazon's delivery driver routes or whatever.