Well, the first problem is the definition of "Single Customer View" (SCV). In my opinion an active SCV certainly shouldn't be considered a service, it's a capability underpinned and delivered by technology.
A true SCV should be dynamic, so as any piece of data changes anywhere the business can see all data linked to the single customer instance they are interested in.
What bureau appear to be selling is simply a deduped and merged file, which they are now labeling a single customer view; this is not a living and breathing representation of the data. It's more akin to a company's audited accounts which are only true at one specific point in time.
Furthermore, this typically only delivers name and address data, leaving important linked transactional data, product information, contact history etc. out of the equation.