FWIW, I agree with other commenters that this is a betrayal of trust but I don’t have anything original to add.
The roll out of this needs to be handled better, with extra care given to privacy settings, and verbiage on the profiles.
For example, Triplebyte has the following language - ‘I am currently open to new opportunities’, heh, yeah, please, show that on my public profile while I have an existing job.
A robust technical assessment site focused on tech is good, especially if it is nuanced in assessing people (not hard cut offs, finding strengths and weaknesses on a spectrum, etc), but please, take good care of privacy and clear communication.