It's also perhaps a bit manipulative. I'm not in any way saying this in a critical or dismissive fashion, but rather given that many here are learning from software like this, and I do think there is a lesson to be drawn from that.
Persuasion and social norms are powerful forces. Giving direct links to your competitors not only demonstrates confidence in your product (e.g. it must be better given that it confidently points you at alternatives), it can also diffuse criticism, ala "if you aren't happy, here are other options that might make you happy".
Recall that reviled Comcast phone call the other day -- the agent was using a tactic as old as time which is to make the caller feel unreasonable and unfair about cancelling (e.g. "until you've given me a good reason", and then a list of why they're better). Such a competitor link list may achieve the same goal for negative reviews/sentiments.
App looks great.
EDIT: Pretty extraordinary how literally (and simplistically) people take the Comcast comparison. I was describing persuasive techniques (of which our society is filled), not saying that Marco is equal to Comcast. It is deeply unfortunate that this needs to be spelled out.
It is also shocking how people are both going forth to fight any notion that this is anything but a purely selfless move wrought by good intentions, but because of such a selfless move wrought with good intentions isn't Marco a great guy (and so "ballsy and classy") and isn't it worthwhile to spend $4.99. I am not sure if the reality is lost, or the fan club has flocked in.
/r/hailcorporate