Perhaps if they reside in, operate from or actively serve the US. In other parts of the world, software patents are unenforceable (as only implementations of ideas can be patented, not the ideas themselves).
Based on their wordlist, they do seem to use American English (so they are probably not located in the UK) but the authors can still operate this project from anywhere in the world.
Mapping some bits of data to a short set of words or pictures isn't even new, neither is the hashing step to ensure that similar coordinates don't use the same name. Validating (session) keys by hashing the key to generate a fingerprint and turning that into words (or these days, emoji) was invented before W3W was conceived. The patent itself is quite flimsy, considering it's just applying some formulas to do something that was already being done on basically any data.
You don't have to extradite the authors if they live in countries in which patent protection is strong and the legal systems are functional enough to impose due process upon them and enforce injunctions/damages. Extradition is typically a last resort, typically for criminal proceedings.
Moreover, an injunction is much more likely to be sought than damages, in which case extradition is unnecessary - all the patentees have to do is get an order from a judge forcing the hosts to take their code and site down.
Many countries don't recognize software patents, and the ones that do have some strict rules about what patents are valid. So, are you sure that this is a slam dunk? You don't seem to have any concept that it might be ruled invalid.
Why "sadly"? They know it is infringement. When you own a patent or trademark you HAVE to go after the infringers, otherwise you stop owning the patent.
This is not true in the US. There is a concept of abandonment for trademarks, but it's not that simple, and the concept does not apply to patents. There is a totally different thing called patent abandonment but it has nothing to do with going after infringers.
There is a statute of limitations on patent damages but you don't lose your patent for failing to enforce.
I'm not familiar with UK or European patent law but I expect it's similar in this regard.
Based on their wordlist, they do seem to use American English (so they are probably not located in the UK) but the authors can still operate this project from anywhere in the world.
Mapping some bits of data to a short set of words or pictures isn't even new, neither is the hashing step to ensure that similar coordinates don't use the same name. Validating (session) keys by hashing the key to generate a fingerprint and turning that into words (or these days, emoji) was invented before W3W was conceived. The patent itself is quite flimsy, considering it's just applying some formulas to do something that was already being done on basically any data.