I've spent whole weekends waiting in at home for a delivery from Amazon Logistics only to get emails at 7pm each evening telling me they tried to deliver and failed.
Pubs tend to be owned by the breweries. I suspect there would be problems if Sky wanted (for example) Greene King to start advertising Fuller's in their pubs.
Last time a recruiter cold-called me at the office I asked them if they really thought it was appropriate to 'phone my client in an effort to recruit me … and then hung up on them.
Their PHP+MySQL tutorial has an SQL injection vulnerability in every example that takes user input. It never mentions SQL injection as a possible problem and it never covers any of the techniques needed to defend against it.
In my book, that's unforgivable and they won't get any slack from me until they fix it.
Plenty of people have made the connection. I've frequently seen people refer to it as "W3C Schools" and complain to the W3C Validator's mailing list about the Validator rejecting code from "your site http://w3schools.com.
How are people supposed to know that they need to go and find a separate security tutorial (and not a W3Schools one, they don't have one)?
Following that tutorial introduces massive security holes into a site. Those security problems need to be discussed. At the very least they need a warning saying "Don't do this until you understand the security issues discussed in THIS OTHER GUIDE".