https://hn.algolia.com/?dateRange=all&page=0&prefix=true&query=Web3&sort=byPopularity&type=story
... you can see that all of the most popular posts have been submitted over the last two months, and the vast majority of those in the last 30 days.
Is this some sort of astroturfing attempt? Have I not used the search properly? Is writing and submitting blog posts about web3 a new trend?
... web3 is pretty much a new trend/hype topic of the last few months, yes. (I'm aware the term has been used for longer, but way more niche than now)