ummm. No they're not. And given human nature, there's no way anyone should want to put any form of "control" in the hands of a few. That goes completely against what the crypto currency thing was originally about. Not to mention the potential legal issues that could come to those running those sorts of nodes if governments decide they're performing some sort of money laundering or get classified as MTSs. It could end up being completely disastrous to create that sort of system and really shouldn't be considered at all when there are alternatives that avoid those risks.
I think Georgem and Coins101 are best placed to respond to your opinion on decentralisation however it is important to point out that SPR is not currently planning on providing financial services with its service node network.