Whilst it certainly looks that way, there will likely be a correlation between loss of business for these apps and Apple's nanny state/protectionist tactics.I don't really think this warning is a "big deal". I've attached a screenshot of the page it leads to just in case Apple reverses course, but nothing in here is bad. In my opinion it's just stating facts to the consumer, giving them more choice in what they want to do for their apps.
A few years back a big supermarket chain here in the UK (Tesco) got taken to court for deliberately buying up parcels of land near its own stores to prevent competitors setting up shop there, independent or otherwise. These companies do it all the time.