Not to mention that the only reference to needing to opt-out is a veiled mention buried in the second paragraph. I skimmed the email briefly, said “oh that’s neat, what a great idea” and filed it under “things for the next job hunt” thinking I’d turn on my profile then.
The link in the email did not work for me: it sent me to my profile, where I was presumably to be able to opt out of sharing my info publicly. But I could not see any way from there. Maybe I'm blind. As usual, googling worked better to find something on the site than using the site itself. Googled: triplebyte opt out -- that linked me to the right place. https://triplebyte.com/privacy-center