"The domain names in question are subdomains of newly registered TLDs that rely on different domain name registries."
There are multiple TLDs/SLDs involved (and the pool will likely grow over time)
Yes it is, but how do you discover the domains? There could be just a few hundred users per domain. Then you have to expend substantial effort to seize each domain.
Meanwhile any affected user just moves to their second domain. Even if the authorities got much better at taking down domains the only issue would be increasing the number of extra domains per user.
I can't see how the authorities can beat this.
> If users can’t access the universal login page, Z-Library says they can log in through TOR or I2P and get their personal clearnet domains there.
The GUID seems to be unique per-user, but also per ccTLD (mine are GUID.DOMAIN.cz and OTHERGUID.DOMAIN.ph).
I would guess that the pool of registered DOMAIN.ccTLD will grow faster than they can be blocked or seized, that new user per-domain GUIDs can be issued on demand onto different registered domains, and that there is an unused reserve of registered domains ready for deployment.