No need. HN has a practice of updating links when appropriate and an upvote system to determine which articles should (or shouldn't) make it to the front page. Banning a source outright because of how some people experience it or feel about its content doesn't seem appropriate (and I say that as someone who _does_ skip TechCrunch articles).
A better idea may be to make a Request HN to use the best possible links rather than easy-to-find links and to encourage that behavior going forward.
And if a TechCrunch article makes it to the front page, then enough people upvoted it to imply it is worth checking despite its origin. Sometimes it's better to have an article from a less-favorable website than one from a site that is more informative but lacks the visibility to reach HN in the first place.