Do the arguments have to be strong? I do not think they need to provide any justification. If the core developers decided that they would be more happy (or less miserable) with a different service, then let them.
"We don't like being hosted under microsoft due their business practices" is perfectly fine argument, no need to nitpick bugs out of bugtracker for justification
If they are not why bother ?
"We don't like being hosted under microsoft due their business practices" is perfectly fine argument, no need to nitpick bugs out of bugtracker for justification