Threads doesn’t really have a track record when it comes to things like this, so I don’t blame them for enforcing their terms and conditions. The difference here is that Twitter has allowed such things to be posted time and time again but won’t allow it in this specific case. It’s selective enforcement.
The single advantage hydrogen has over batteries is that the “refueling” is pretty much instantaneous. If charging infrastructure and technology improves, there will be no reason to bother with it anymore.