I built a big blaze crusher xp farm in the nether only to find out after that grief protection was disabled in the Nether. Is there any way i can save my crusher that took lots of time?

Try to hide it. No other way to really keep it safe. Place some netherrack or lava falls to discourage someone from getting close to it. Key thing is keeping it from standing out by making it appear natural.

maby i could give neil all ownership rights, and he could make another farm and since he is a mod he could protect it right?

it would be a waste to let an amazing blaze farm go to waste. <object class="emojione" data="https://resources.enjin.com/1489581540/themes/core/images/emojione/svg/2639.svg?0" type="image/svg+xml" standby=":(">:(</object> i dont think there is one like it yet on Agharta

Land claims are disabled in the nether and end. Even Neil wont be able to claim for you, it's just how it is.

Just because you cant claim it doesnt make it a waste either. Just use it and hide it like Hagan said.

its in a nether fortress above a massive pool of lava with tons of.redstone, but ill see what i can do <object class="emojione" data="https://resources.enjin.com/1489581540/themes/core/images/emojione/svg/2639.svg?0" type="image/svg+xml" standby=":(">:(</object> so if someone destroys it that its my fault?

Some people do try to destroy them just because there aren't protections but since spawners don't drop eggs there would be no point. If you can, set a home there and break your portal to hide any trace that you have been there. If you don't have another home, block access to the portals on both worlds by hiding them.

Also, make a obbsidian fortress around it! and lock the doors in!

Only one very expensive way to keep it safe. You have to surround it in bedrock that can be bought at the credit shop. and then set a home inside it.

That suggestion has been shot down I don't even know how many times now, by both staff and by the community as a whole. Give up already, wawon. It's not going to happen.