Given that there were lots of companies that abandoned Window's phone, I'm not convinced it's related -- I suspect Waze would have abandoned it either way.

Honest question: if you ran a software company, would you devote any resources to a Windows phone version? If yes, then why?

You know, the entire installed app economy has turned into a big mess.

Would you devote your resources to an Android or iOS app if it isn't backed by a service which is useful in and of itself?

What about desktop Windows apps? Every time I see others interact with a Windows 10 app, I feel like throwing up. Mac apps seem to be doing slightly better, but that might be because it is an inherently tiny market.

Now that everything has moved to the web, people are trying to outdo each other with the creepiest possible tracking analytics. If you wish to develop useful, paid software which is mostly unobtrusive to the users, I would say you are already about 5 years too late.