Hi,

For info:

I experienced today that my mobile banking application refused to open, and the reason it gave was that there was a suspicious accessibility service called MBraille Beta on the device.  It told me to uninstall MBraille Beta. 
If I were not the author of MBraille, I would have been worried.  :)

The reason for this is that Accessibility services are privileged applications, and Google has not yet vetted MBraille accessibility service, which I had to do to enable full screen braille input while TalkBack was running.

Again, once MBraille is in Google Play store, this should no longer happen.