It's possible that there is a decent amount of "talk" in terms of podcasts, conference talks, etc. But Google trends probably is more reflective of what problems people are solving on a day-to-day basis. I doubt Webassembly is ever going to be the actual concern of that many developers, even if it gains popularity. But idk.
I think blockchain is a huge outlier in its capacity to gain mainstream traction. Even when Webassembly is well-established, I doubt the news will report on it.
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