Startups certainly "take responsibility" for announcing and heavily publicizing their fundraising rounds. It's a strong signal that your company is on a path to success (not the only path) and you certainly want it spread as far and wide as possible.

I don't care if some people think my funding announcement less valid than other industry news, or somehow "less earned." The fact that there is a market for that kind of news means that enough people derive value from it. Not all news is valuable to all people: celebrity news and financial news have two very different audiences. If an investor is accidentally exposed to celebrity news at the grocery store checkout line, is it the fault of the celebrity?