Recent changes in the relationship between Bing -> Edge makes the question interesting. Should we accept the bingbot behaviour?
The last couple of weeks we have seen -in northern Europe anyhow -Bing starting to index content based on URLs opened with Edge, making massive amount of "secret" data available that never was meant for the public because Edge is now feeding bing with all those "secret" URLs only you visit. So your email with the obfuscated link to show you a private receipt after the hotel stay suddenly are indexed and published by Bing just because you opened the link and viewed the receipt through the Edge browser. A search with the "site:" parameters are now starting to reveal peoples private stuff from hotels, to art purchases and even shoving bank and credit card invoices because a lot of web services serve this stuff through long, secret URLs that normally would be impossible to guess and get access to. But Edge gives it all away to bing, for free. And you probably signed it off in the user agreements anyhow.
Of course these kind of data should never be accessible without proper authentication, but in real life secret links like this are wildly used.
I use obfuscated links in one of my websites for one specific purpose, but its not revealing any private or sensitive data thus it is harmless. Still I don't think all these links should be indexed by Bing just because the users are visiting them through Edge, they should be given to those they are meant for and nobody else. So i temporarily blocked Bing until a solution was in place.
I find little info of this new and dodgy Bing - Edge behaviour on the internet so far, other than papers writing about the small scandals its beginning to create in our country a few weeks ago.