Remember, a lot of these guys are smart and fully realized the 'new gTLDs' were a massive scam, but they also hoped to make a ton of money off the rubes before the grift became evident. It's a tale as old as time with the ethically-challenged.
Look at NFTs - anyone with a brain understood this was a pure scam, but you had a lot of smart domain investors (Andrew Rosener, Shane Cultra, Andy Booth, etc., etc.) who were all in up to their necks, selling NFTs, hyping them like mad and being massive NFT hucksters. Did they actually believe NFTs were a good investment? No way, but acting like they did made them a crapload of money.
And when the NFT bubble burst, these shills immediately disappeared from the NFT market and went back to selling domains. The shift with Rosener was insane, as one day he was screaming about how NFTs would outpace domains, and the next his "NFT huckster persona" totally disappeared, to never be heard from again.
Pretty good trick, right up there with Keyser Soze.