Interesting – so your objection is not only to the bot, but to URL shortener sites in general. I cannot speak to that, other than to say that I picked tinyurl because they have been around the longest (as far as I know), and have an excellent reputation.
You've got a point about teaching people how to find things on the Wiki; I kind of like that idea. I could probably analyze foldit links and attempt to direct people through the site. That might be tricky, since the fold.it site is not renowned for internal consistency, but it's worth thinking about. Of course, this would make the bot significantly noisier, and might make others unhappy.
But it does not solve the problem of long URLs for sites other than foldit sites – like CASP. The folks who help out in IRC take a lot of time and effort to do so – and while they are capable of writing click-through directions on any URL, I am in favor of any tool that makes their lives easier, and not harder. It also makes things easier for the recipients of the URL – who are probably being told to "read and learn," and if urlbot makes it more likely that this will happen, hooray! for urlbot.
(Admittedly, not all URLs posted to foldit are protein-related, but it is precisely the fun one can have with other folders that draws many people to this "game." So these should not be excluded.)
But the main justification for what I did is this: think back to how many times you've seen a request like "I can't see that whole URL. Can you post a tiny version?" It seems that URL shorteners are the solution of choice; all I've done is automated the process to save folks some time.
That said, I have an idea. What if I split the posted URL in such a way that it wraps in IRC? For 99+% of URLs, this would involve nothing more than adding a space after each slash. That way folks who do not trust tinyurl can type in the full version. Even folks who do use tinyurl would probably appreciate the security of being able to read the URL that they are being directed to. (I know that I would.) I dislike anything that adds noise to the IRC channel, but if it has value I'd be happy to add the feature. What saith the ops?
And if folks like the idea of teaching a noob to fish – that is, explaining how to find a link on the fold.it site, I can look into that as well. I might leave out the bit about the trout, though. :-) My thoughts: I suspect that anyone with enough interest will learn their way around anyway, so this might have a fairly low benefit-to-noise ratio. Still, I think that B_2 has a clever idea, and maybe we can find a way to use it.
One last note: I appreciate the sentiment behind such adjectives as "rogue" and "uncontrolled," but I remind you that urlbot is easily controlled. All it has to do is misbehave once, and poof – it's gone. So (in my mind) that moves the conversation onto one about the relative merits of URL shorteners vs utility and common usage. I have some additional thoughts on this, but for now I'll let the comments above stand.