Only just got you in my recommendations, and unfortunately, you've made a big legal slip up regardless of where you are. The big thing is, you still own the "body" as you kept refering to it as, the companies running the brain never take the body away from you. Ever. If you excersise your right to modify and reverse-engineer the product you paid for, after signing an EULA (which is legally a contract, if the law can be bent to accomidate the contract, it is), they revoke your connection to the brain, they revoke the service part. The caveat is, you DO still own your licence, and software. You can modify, change or reverse-engineer all you want. That licence still works to make the software you own yours, just not in a full capacity. You pay for both a good (the licence to the software part) AND the service (to the server software). They can take the service away at any point, as per their EULA. They are not obligated to give you that part (the server software) at the end of the service's cycle, as it is NOT part of the good your licence gives you.
HOWEVER, as a consumer, a lot of this is obfuscated and there may be (depending on location) laws about the "reasonable person" to expect such an ending to a games cycle, I'd love it if businesses posted source/unencrypted server software but i doubt they'd do it without incentive. I'd guess the best way to do this, it to incentivise them to get paid to end the games life, and leave it with the community. I'm pretty sure a campain for "oh hey, raise (£/$/....) 100,000 and we'll give the code out for all to use/change/adapt/redistribute without the need to buy it!" OR "we'll licence the server software for £/$/....X000 per sale" they'd be much more on board with it.
I'm just a random guy on the internet, I hope this information doesn't dissuade you from fighting, but without a legal footing, I'm sorry to see you defeated.