Will using Android Emulators get your account banned?

I can't say for sure, but I haven't heard of anyone being banned yet.

To be honest though, I would prefer if they prohibited people from playing on their PC's

There's too much risk of hacking.

card games like heroes are impossible to hack since they are server side. that means the server gives you cards and you tell the server which card to play and so goes for your opponent. only games that can be hacked are client based games (some stupid games are client based) so if you are the client you can hack or FPS games in the way of aimbots and such.

p.s. theoretically the server can get hacked but generally not doable and it won't be hacked from in-game

I agree with you but I want to hear an official response from EA. Could someone from EA please answer my question?

regardless of an official response a lot of people do it, like most of the streamers & youtubers for instance, and they are not getting banned.

I wasn't aware of that. I'm sure it's fine just better to be safe then sorry.