My advice is specifically aimed at commercial grid owners who are looking to make money from OpenSim (which is why we have "Business" in our title).
If you're a commercial grid owner who's plan is to remain anonymous, and to move servers if someone complains about infringing content or threatens a lawsuit and attempts to take down the grid that way, then you've got a problem with your business model.
I wouldn't mind attending an event on such a grid, but I'd have doubts about investing a substantial amount of money into that grid's virtual currency, content, or land. And if I was a content creator, I'd have doubts about having a presence there.
In addition, if you're running a commercial grid, it takes more than 30 minutes to switch hosting providers. InWorldz recently expected to be out for as much as 24 hours during their move -- and I don't know how much time they spent prepping for the move, ahead of time.
And some grids would have an extremely hard time moving. Kitely, for example, runs on the Amazon cloud. It is possible to migrate Amazon applications to other providers, but the more closely integrated you are with Amazon's proprietary platform, the harder it will be -- it might take them weeks or months to adapt their infrastructure to run on that of another provider.
Kitely and InWorldz are both legal entities, with real people running them, and all contact information available on their websites. Both also have DMCA agents registered.
It doesn't necessarily mean that Kitely and InWorldz are more reliable than an anonymous guy running a mini-grid on a virtual server -- the anonymous guy might well be extremely reliable -- but when something goes wrong, there are people who can be held accountable at InWorldz, Kitely, Virtual Highway, and the other big commercial grids.