Just paying my visit here once a few months for a brief comment:
I don't want to praise myself but I think I can claim to have some knowledge about the PServer thing in general. Not game-specific. What you witness now is something that occurs for every single MMO for which the files were released. As for SRO, which has been in some special state with PServer monopolies for several years, this is just the start of what the scene will be experiencing.
PSRO has just left the stage of building up a PServer base with tools, guides and other files being released for public use. Dozens of more or less experienced people took advantage of that and as you can see, the accordant section here is blooming. That's how it always goes. A good thing if you ask me. Anyway, now that the stage of experimenting is over, people start to think of it as a "professional business". Which I think it isn't, looking at the way those projects are handled. People think they can make a great deal of money and some may even do for some time and this attitude brings a very common phenomenon with it. People who want to exploit that situation and the lack of professionalism that is just omnipresent in every PServer scene. Therefore, DDoS attacks. And I can tell you, this will never ever stop. There will be times when it will be less noticable but it will never ever go away. Now here's some hot speculation of mine. The publishers know of all this. The huge problems PServers bring with them, the DDoS attacks, everything. And that's why they actually don't give a flying duck about it. Of course when they are asked, they say they will do something about it, but I think they know very well that those who participate in that scene are not a danger at all. The servers are poorly managed and generally short-lived. Most of the players wouldn't play official SRO again anyways. The only thing that might itch them a bit is that some actually do make some money out of what they created. A fair thought of course.
Long story short, this is nothing that should have come unexpected and you should not expect the situation to get better.