Most of the pkg files released today are compiled with the leaked official SDK, obviously without license. People who deliver u these files are taking legal risks. If 'They' wanna sue their arses, they'll do. Legal Status of jailbreaking instead isn't perfectly clear.
Quite simple: If it is possible to release awesome stuff without the risk of any legal issues, more people will do. You will get more bang out of your PS3.
Besides, all the other ftp apps are crappy and from my knowing not released open source. Reason might be, that they only use the crippled libraries of different SDKs.
I can't understand, why all the people are hating.
Great effort! Will try it!