This piece of shit site is a snitch site to enable fascists to harass drag queens, any children attending these events GNC people in general, and any parents who would dare attend an event which encourage their child to read.
It needs spam. And it needs it now.
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Also, this shit was a crude and naive approach back in 2008. The fact that it worked on Visa and Mastercard was extremely embarrasing. The entire internet would be on fire if this shit still worked. There's a reason these trolls are using services like cloudfare.
If you are going to do a brute force attack, it actually has to be BRUTE force. Sending a bunch of packets from a residential cable internet connection isn't going to do it. You need a good portion of a datacenter plugged directly into the backbone to do it.
If you want to fuck something up from an extremely slow (relatively) connection, you need to find a way to make the service do a thousand times more work per request than your machine is doing. For something as simple as a text submission form, there may not be much to exploit.