It’s also not the largest. During the age of sail one of the largest shipping boat was almost 8 times larger than this one. They are just playing the technicality of being wind powered and not a sail ship to con startup investors out of their money. But there have been even larger sail cruise ships. It’s just the game tech bros play, reinventing the wheel but coming up with a catchy marketing name that looks like disrupting the status quo to bait capital injection.
Yes, you can share location, the widgets aren’t as fancy as Google integration with everything.
Not feasible without the constant data harvesting in the background, which it doesn’t do. It doesn’t log your every move as Google does. Privacy vs surveillance, will always be at odds.
Depending on the area. In my country public transportation is way better on OSM than on Gmaps. Oftentimes Gmaps won’t even have large structures like train stations or bus terminals. It depends on users and contributors.