I only associated Pulitzers with journalists, reporters, writers, and other professionals in that vein. It's a fascinating new era where anyone (not just professionals) could be eligible because of the Web and its ability to connect people.
EDIT: As Anders points out in the article.
I would like to be believe the Pulitzer Prize should recognize exceptional work and the fact that exceptional work can come from anywhere shouldn't really be a problem.
So, if the goals of the Pulitzer prize were to reward good journalism, I do not think this would be a good choice.
However, if the goals of the Pulitzer is to reward good writing that has an impact, regardless of whether it is journalism™ or not, then this seems like a good fit.
I feel like the Pulitzer prize leans towards the former though, if you look at the National Reporting Pulitzer this year, it went to WaPo for some Trump reporting, which AFAICT has had no impact whatsoever.