Inaccuracies and misconceptions
Re: this part of the article:
"The service, most often referred to as BlackBerry Messenger..."
Not true. Blackberry Messenger (or "BBM") is a separate service, a proprietary Blackberry-only instant messaging service. Whereas PIN-to-PIN messaging is basically Blackberry-specific email.
One advantage of these proprietary services is that in many countries (in the developing world in particular) they have been bundled into inexpensive "BIS" (Blackberry Internet Services) data plans, which is a key reason why Blackberry remains popular in countries like Indonesia and South Africa.
There have long been misconceptions about BIS, including the security of services like PIN-to-PIN messaging and BBM. While back in the days when BIS was new, even its low-grade "scrambling" was much better than the mostly completely insecure alternatives, these days encryption (typically using SSL or TLS) is becoming more the rule than the exception for online services, not least due to all the hacks and exploits that have become so commonplace.
The truly secure Blackberry communication system has always been its Blackberry Enterprise Service or "BES", and that remains the case to this day.