What constitutes a truly accessible web map requires extensive user research, however as can be seen in the
Web map tools WCAG 2.1 evaluation (presented by Nic Chan at the 2020
W3C/OGC Joint Workshop Series on Maps for the Web, available in
video format and
slides) there are quite a few opportunities to improve accessibility in the UI of Bing maps that would immediately benefit the end-user.
In the evaluation report I have deliberately not included any
techniques sufficient to pass a particular
Success Criterion for brevity, however I am hopeful to see efforts to improve the state of accessibility for Bing Maps!
Thanks.