One of them is following me, but with a bunch of extra spaces after the exclamation point.
I don't usually check my followers, but I happened to be in there a couple days ago. The only person following me then was my wife, so this bot/spam is relatively new.
That issue with Boost may be device dependent. It is only a split second of black for me on an S23. But, i agree it should just be better no matter the device.
For Voyager, there is a setting to show the instance.