The whole situation just seems very weird. If you are going to shut-down a website and absorb it into its sister website, the professional thing to do is to announce it ahead of time, and make everyone aware of what is happening.
If you have technical issues the professional thing to do is to make a public announcement about the problems and explain you are working hard to get it back up and running.
No matter the underlying cause for BOM's temporary disappearance it is clear that Amazon simply doesn't give a fuck about the website anymore or they would treat it, and its viewers with a little bit more professional respect. BOM may be up again for now, and it may stay up for a long long time, but as of now I have zero reason to expect that it will continue existing for any reasonable length of time given how little they seem to care about it.