Your question re-framed as "why is any famous person's opinion on a topic outside of their expertise worth anything more than some person in a bar?" Is an entirely fair question with the answer "It isn't!"
Sadly we seem to a very, very long way from that obvious truth. Being famous is vastly more important than knowing something through hard work when it comes to your thoughts being heard. Especially given most famous hollywood people are famous for being attractive to look at and if they have any skill at all other than having luckily failed upwards that skill is to lie, convincingly enough so you believe it even when you know it is pure fantasy, the thing becomes clear. There has been many such people opining on NFTs.
From TFA: Hence, it’s incredibly refreshing to see Reeves react so honestly - most celebrities have embraced the technology with alarming enthusiasm; beloved figures such as Snoop Dogg, William Shatner, Doja Cat, Tony Hawk, Eminem, and Grimes have all endorsed NFTs. Reese Witherspoon even tried putting a pseudo-feminist spin on the fad (because equality means women should be participating in pyramid schemes too!).
I don't know how to counter it. I strongly think that any agreement concerning the content of an interview (no questions about X, if my PR client movie star looks bad you never get another interview from anyone I represent etc.) in the media should be the opening paragraph but there are so many ways around it. Maybe if a few reputable news organisations had a charter they followed saying they will never agree to a no-go area to secure an interview and were willing to fire any employee who does it in disgrace, celebrities might have their luster reduced compared with people who should be interviewed. Also the transcript of any interview should be published in full as there has been a lot of BS from the media where the pretend to do an interview then report "impressions" from it rather than its content which have clearly been very misleading at times.