is it legal to cature nations, give them a list of rules they have to follow that will restrict there nation greatly, and force them to pay you 3 mil and 50 tech every 10 days if they do not follow they will be zi out of the game. i was thinking of starting this up. i would never release there nations though so pretty much they will be prisioners for the rest of the time there nation existed. its a good way to get tax money and tech from other nations. its a pretty thaught out process i think i got all the loopholes covered im not gonna explian it all so people dont really kno how im doing it u kno.

It's not illegal but I very much doubt this is going to be a successful venture for you.

Is it against the game rules? No. Is it a good idea? Probably not. Retaliation and getting ignored are probably likely. And, I see you're in an alliance from your profile. I'm not familiar with MA, but I know that my own alliance wouldn't allow that, so you might want to check if you haven't already.

I foresee this being a very successful endeavor. You should start immediately. I'd target members of alliances, that way you can force the other members to give you money and tech as well.

It isn't against game rules to my knowledge, so good luck.

You can't ZI anybody "out of the game".
Bullying, threatening and acting like a thug is legitimate according to the game rules, but it would also lead to your demise. You would quickly collect many enemies and many other players would come for you; I in fact believe that they'd need to struggle to get an open war-slot on your nation.

(If you really plan doing this, anyway, please be sure to PM me about it, including the identity of those you'll be extorting: I'd be interested to witness how the "experiment" goes on.)

It's not against the ToS, but if you try to extort the wrong people you'll just end up getting rolled.

That said, I invite you to try me, my soldiers are getting close to their pensions, and I have a shiny new WRC to try out.

It doesn't sound like you would be doing anything against the game rules here. Locking.