US startups are completely different than Dapp ‘teams’ (I have a lot of experience with both). For starters, the US is obviously localized to one country. This has changed quite a bit over the years as most of the startups I worked for in the past decade did some amount of offshoring to Eastern Europe and SA. Startups tend to want some kind of recognition because of the investment structure and time frame - they either want to be a unicorn or an acquisition target. So it’s in their nature to want to have attention. In fact, they need it; they need the buzz to get the user base, to either get more investment or revenue, etc.
Dapp’s and crypto environments are very different. It is still even more wild west than startups, they are world wide, and one person can still make something big. I personally anonymize most of the projects I work on for two simple reasons: hacking and targeting.
Numerous crypto folks have been doxxed for whatever reason and I personally know more than a few that have lost access to their primary online accounts through sim hacks and/or password related hacks. Being a part of a youtuber, for instance, with 250k subs creates an attack surface for anyone on a team associated with them. There is a massive difference when your resume shopping within the community and sharing your public persona vs. being named in a video with a million views. That’s just a fact of life (this also happens with startups, but I think it’s less since crypto is still young and ripe for exploit).
And yes, crypto is targeted more because the money is built in. If you breech a server in a real world startup/app, then you will probably not be able to steal millions. The payment processing systems are fairly well segmented and have been around long enough to build the protections in (plus, there is an entire sub-industry in banking/payments to counter fraud).
In crypto though, you have much more opportunities. You could get a wallet private key on that server hack or you can find an exploit in a contract. The latter seems to be the preferred method for a lot of folks and has had big consequences. And frankly, contracts are hard and when I hear of hacks, I’m not surprised; traditional development doesn’t usually expose the inner workings of the codebase like contracts do. Some hacks have been done with a simple 1 line error in a contract.
So, tldr; crypto is more public and younger than tradtitional dev - it’s still very much the wild west and immature technology yields a big attack surface (this is good and bad). Devs have a legitimate claim to anonymity as they are targets for doxxing/hacking. Dapp scammers are real, but small (I think) in comparison to the amount of dapp’s out there and I don’t see this as the main reason why they want to remain anonymous.