I'm not sure why they posted those news now, when there have been private servers running for 20 years. It would be smarter to go after topsites, and even private server listing here on RMS, than it is to take down private servers. Though, I do expect it would be a DMCA notice instead of a straight lawsuit.
Either way they go at it.. people will still find a forum or community where private servers are advertised. Shutting down big servers will just push their communities to the next best private server. Rarely will they go to official servers.
Opening a private server literally takes a couple of hours of work.. and I imagine they will not be able to take down every server that pops up either.. as many measures can be taken to remain anonymous while hosting one.. especially in the web3 age, thanks to blockchain domains/hosting and crypto payments.
Their best bet is to really come up with a better product. Offer something that private servers are not offering or able to offer.
They need to focus their attention on what killed their official servers in the first place.. which are:
1. Easy to bot
2. No mechanism to ban computers, only accounts.
3. Pay to win
4. Rare GM interaction with players
5. Poor response to player suggestions
6. Inability to encrypt their sprites/files.
It's mind blowing that even after 20 years of private servers, they still have unencrypted grf and clients. If they were to encrypt their 3rd or even 4th job sprites before they released them, maybe people would of been forced to play official servers to enjoy those new classes.. but they failed at that too.
They could of also just focused their attention on their RO2 game... instead of continuing to expand the progression of a 20 years old game, where newbies need to play and/or pay for years in order to catch up and compete with veterans.