I really would like to see TC just gone. It didn't use to be this bad, but they've been going downhill since... forever, really.
This is suddenly very reminiscent of John Mulaney describing Back to the Future...
It's also worth considering, when thinking about why it hasn't been banned, whether or not the main value from the threads (assuming the perfect source) would be from the link or the comments.
For some types of submission, it's the link: personal blog updates, academic papers, interesting technical achievements, detailed research, so on.
For others, it's the comments: company updates, interesting world news, most things happening in real-time, obituaries, so forth.
For others still, it's tied: blog posts on historical subjects, 'Show HN:' posts, submissions about different ways of doing things than mainstream methods.
Product launches, from my perspective, fall in the "Value in Comments" category. So then you have to decide whether it's worth the trade-off. By banning TechCrunch, would the site lose comment value?
Looking at this one, you'd really be missing some good comments by getting rid of TechCrunch links; there are all sorts of anecdotes about the product in this thread, and there are a bunch of interesting anecdotes about competing products as well.
This isn't even a review. This is someone writing from the press release.
"If this URL looks like an ad or a press release, please consider finding an original source for the information."