There's a good reason for that though, it forces the enemy side to make an account, which could be advantageous for numerous reasons, like:

Red pilling them, Obtaining access to their devices (if they're a terrorist/freemason/traitor),

Preventing only MAGA pedes from signing up and having it labelled a 'fAr RiGhT wInG cOnSpIrAcY sItE",

For unknown security reasons,

To incentivise more uptake among the general population (be honest, you prolly wouldn't sign up if you didn't like social media+didn't need to sign up),

and probably a host of other reasons. More benefits to an account wall than negatives, I think.