Back door to registering online IDs.
Can’t search for your online public activity if they don’t know what handles you’ve used.
Would make it a crime to NOT report all your handles, lest your FrankDobbs1977 be for politically correct content, and SoveriegnSociopath be an apparently unconnected persona for your subversive anti-gov’t agitation.
Yes, for this to work, you would have to submit a list, under penalty of perjury, of EVERYWHERE you post, your ID there, and your password if the forum supports private messages.
No way for this to be constitutional.