Eightblack, I don't expect any compensation for being on a 777 instead of a 380. What irritates me is the fact they changed my flight (not just put me in F on the same flight), without telling, let alone asking me.
And I do think it is reasonable for one to expect compensation for something the airline did to suit its own convenience. I think the situation is similar to being denied boarding and being asked to take another flight.
I've sent them a note, as the data privacy issues are particularly worrying. What if I was someone famous? I'll see what they get back with.