Not only that, but I don't think it's even same service provider company at each hotel. Just because it has the same brand-specific splash or logon screen doesn't mean it's all the same provider, different providors in different parts of the country could have all been given the same specs as to what splash and/or logon screens to use.

Plus the details of internet access is clearly different from one Hilton family brand to another (for example, HGI having the remote printer stuff, etc).