Hi, I'm David and I've worked along other engineers at Brave on this! Thanks for your feedback, it would certainly be a nice addition, although we may want to focus a bit more on quality first. Thanks!
Bing visual search is great. I use it in cryptic hunts a bunch. Would of course prefer a non-MS offering though, I hope one comes along that's equally good.
In the last few months Bing has been much more reliable for me at reverse finding original sources of cover album images that have been posted on Discogs. Google seems to not give me images that have been posted a long time ago (10+ years maybe), but Bing still does.