That said, everyone also wants to be a martyr. TPB wasn't about rights or freedoms or standing up to government oppression. People used it primarily to obtain media and software without paying for it. It does sound like a noble crusade when he expands the context to include SOPA or PIPA or net neutrality, but TPB isn't really related to those things and served only as a rallying point for people who feel strongly about them. The ideal of freedom of information is only tangential to fighting the good fights that he listed in the opening of the piece.
The truth is that Sunde didn't have to go to jail. TPB's popularity gave him a platform and helped him to centralize an ideological movement. But there are other ways to do that, significantly more effective ways. Martin Luther King (as an example, not a comparison) went to jail too, but he also went to the right schools, wore a suit and influenced the right people. Creating a popular and morally dubious website is a quick way to put your ideas into the spotlight. But it doesn't last, and it doesn't really change anything. His effort and conviction are genuinely admirable but he's still a long way from winning the battles that matter.