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Hello. This is because the game currently works only through Steam multiplayer. I am an indie developer, so I have to use the opportunities for promotion that are available to me. There is nothing shameful or wrong.

(+1)

Its still wrong, indie or AAA nobody should do it, have you seen the back lash Deep silver got for using steam for advertising only to now sell a game on epic.   This is no different. 

Now if you still offered your game here as well as steam then that would be ok!