I have been using Link2VoIP myself as a backup/stand-by VoIP service to my other two primary VoIP providers for a year or so. About, 5 years ago, I was using another Canadian VoIP provider (Allo.com) who also went belly-up. These occurrences just validate my practice and recommendations of always subscribing to at least two or 3 VoIP providers (there is nothing like having a backup, or two).
I find it quite interesting that Link2VoIP's announcement is almost coincidental to the launch of Dell Canada's new VoIP service (Dell Voice) earlier in February. I guess this falls in line with them citing "rapid increase of competitive services" as a contributing factor. Well, it is hard to compete with "free" phone calls across Canada as promoted by Dell Voice and Google Voice.