Plus I am pretty sure people have used it before Apple...
Yes that is the required standard reply for anyone that doesn't want Apple to win....
it's not true, but facts aren't things some people take much notice of.
There was no 'app store' before Apple termed the idea, but Amazon et al are banking on the fact that if enough competitors use the term it will be deemed 'generic' hence why Apple are going after anyone using that label..
.if they didn't they are tacitly admitting that it has become generic.
It really isn't that hard, it's basic business, try and hold on to what makes you the market leader.
The fact that some judge, who really ought to know better, is letting Amazon steal the idea doesn't make it any less of a case of blatant copying.
It was lazy and devious of them and they should be forced to desist.