Most of the improvements seen for navigation in google maps (over the past decade) is due to them pulling the information and replicating a lot of features from Waze.

Waze is owned by Google. They bought it in 2014 (someone please correct the year, if I’m wrong). It’s not FOSS.

Waze was amazing. Sadly, a lot of features have been removed over the years, in an attempt to shift people from Waze to Google Maps. Waze in 2016 was better than the current version.

No.