Go Map!! is particularly good for editing, while OSMAnd is a more full-featured map application which also supports editing.
The routing algorithms are okay though.
Also, I couldn't find any info on this matter: some quests ask you what number a house is. Wouldn't people find it strange that a random person is standing in front of your house and looking at the number and then types on their smartphone?
AFAIK house numbers are not private info, but still...
Well, they can. Whether or not the police will bother doing anything can depend on a lot of factors.
Years ago I heard that Apple was going to use OSM data for their map app. I contacted OSM to remove our driveway. They did demote our driveway to a "private road" (the best I could do). Luckily, our driveway is not in the Apple maps app. I am still somewhat irritated particularly when I see our driveway in apps like this.
Hopefully you'll make a few more corrections as well, but even if this is the only edit you make, it is a contribution to the whole.
TIGER doesn't have all that much differentiation for minor roads, and the import didn't do anything other than a direct mapping of TIGER classes to specific sets of tags. For unnamed residential streets, it probably should have considered things like length and connectivity to downgrade a bunch of streets/roads.