I'm not sure, but I think a court would take a very dim view of a claimant rushing to litigate without first trying the long-established DRS route - especially the mediation part.
A court case would also attract much more publicity than a DRS. Assuming the name has been dropped by mistake, this is already embarrassing enough for Markmonitor and/or CSC Corporate Domains. Why would either of these brand protection companies want to advertise their abject failure to protect their client's brand by allowing this domain to drop?
Furthermore, what would be the cause of action? Passing off? Not if the new owner's site made it clear that it had nothing to do with Twitter/X. Infringement of trade marks? Again, not if the subject matter was unrelated to the classes covered by the trade marks (which I haven't checked).
So I don't think this is likely to end up in court.
Firstly, a court would not take a dim view on a claimant not using mediation. There is not a single case to support this claim you have just made. However, if Twitter/X did go down the DRS route, and lost - they'd have no way to appeal this in DRS or Court. (
Michael Toth v Emirates [2011] EWPCC 18)
However, if they decided to ignore the industry mediation, and go straight into a trademark dispute case, they would have access to appeals and the well established legal system of the England and Wales, which predates Nominet existence by a couple of centuries - so which is more "long-established"? Even the IPEC predates Nominet, let alone the DRS.
Also the court definition of bad faith is much wider than the DRS, you can be found to register a domain in bad faith by simply registering a domain, with knowledge of the trademark owners rights to the name, without a legitimate purpose. Much wider definition that DRS.
"BTW, another relevant DRS is D00015585 (mango.co.uk & mango.uk), another dictionary word where the complainant had multiple trade marks that pre-dated either domain's registration. Granted, Mango is nowhere near as well-known as Twitter, but other than that the circumstances are similar."
I would like to stress DRS doesn't have a precedency system, so this really doesn't necessarily prove anything, and Mango is not as well-known as Twitter - Twitter is one of the most recognisable brands WW. I also think the fact that Twitter.uk Also, I briefly read the facts of that DRS, Mango (company) never owned Mango.co.uk - pretty big, factual difference in the cases if so.