Also, I like how you couldn't answer some of my questions. Completely avoided some.
But in response to your first paragraph, how does such a database or another system, of sorts, change anything? A server owner can do whatever they want.
And I have successfully stopped troublemakers from my "Admin Playground" server. (the only server of mine that gets trouble makers). With a 100% success rate. I can show you how it works if you would like to see.
As I mentioned, the entire range of IPs of a user is given to anyone who requests it from the ISP. Meaning that if you had your range banned, your neighbors wouldn't be affected, only you and any IP you could ever be given by your ISP.
In the case of a proxy service or other range (belonging to a hotel as you suggested) it is the server owner's choice whether or not to ban that range. If the range gets banned it probably serves more good than bad to have it banned. (i.e. trolls use that range often to cause trouble) Most servers owners would do that to keep a server civil.
I wouldn't offer any of my servers for tournaments anyway, none are hosted by me and they are specifically servers that do not already exist. They wouldn't be any good anyway.
Lol saying that it "seems" like I'm a fatalist, then apologizing because I see the world that way is still an assumption. You could have saved yourself if you had said something like, 'sorry if you see the world that way'....
But that's neither here nor there. It's not about how I see the world (but to satisfy your curiosity, I'm quite the opposite of a fatalist) but rather about what I said earlier. "A server owner can do whatever they want. "
And as history shows, "tools" such as this are, in a sense, inevitable since server owners do what they want and since this "tool" idea is a possible thing to do. It is more or less bound to happen and it doesn't need your permission to occur.
The reason why I suggest paranoia, is because the methods these "tools" use are already proven to be safe and effective. Which leaves either a concern for privacy (which is unfounded and based on ignorance) or a concern that you are no longer able to troll without consequences. I cannot think of another reason why you wouldn't want such a "tool" to exist as it has no negative effects to a normal/good tronner. I had given you the benefit of the doubt that you are not a troll, which left me with the first option.
I make so much trouble

If I was such a trouble maker, why would I support this? Don't you think I would play under alias, instead of always using "Durf"?
I know why you call me a trouble maker and it is of no concern to me; you are entitled to think what you want.
IMO I think there is a significant number of tronners who would disagree with that assessment.
But it wouldn't concern me even if I was a trouble maker

I'm just trying to make you realize how pointless it is to complain about something that is already occurring on other servers; just because Light tried to offer it to people who don't have it but could use it (for good as he tried to imply/enforce) doesn't change the existence or use of such "tools".
I guess you can say I am fatalist in the sense that there is nothing you or your opinions could do to have any effect in regards to all the concerns you had about a 'tool' such as described.
Frankly you should still be concerned about all the servers that do it but don't tell you.
So complaining to Light is pointless, he can do what he wants.