Gnutella has now become too big. So it's now a major target for spammers/record labels. Because it's 1 massive group of sharers then a blow to one is a blow to all. If it was made of smaller independant sections a blow to one wouldn't affect the rest. People and bots could be in control of the sections so fake sharers, leechers and spammers would have a much tougher time. They have to get by a registration process, users being able to quickly report any trouble, bots etc.

But with such a huge un-regulated system, it's just too easy for these spammers/agencies to run amok.

The analogy could be 'Hey! In Virtuaworld we've got the biggest swimming pool in the world, everyone's welcome.' But it's so big that it can't be staffed, so you can poo in the pool or dive in the shallow end or come in with verrucas... whatever you want! The sensible, strong swimmers can't swim a length without someone dive-bombing beside them.

Whereas on the other hand - 'Hey! we're a small pool designed to cater for sensible swimmers only' This way a few staff are able to make sure everyone has a wristband, no-one craps in the pool etc. etc. It makes for a much more pleasurable swimming experience! And if you want to you can go to the pool down the road which is a specialist in waterslides.