Its common sense after looking at their numbers and business plan. I dont have time to dissect every scam out there, but wanted to drop by as the voice of experience and reason for those who lack both.
If their numbers don't make sense to you, it doesn't automatically make it a scam. A scam implies that they're going to take all the investors money and run. I don't see any indication that this will happen, do you?
I believe that they will begin operations when they say they will and will pay their investors. But the return on investment is going to be highly dependent on BTC value at the time of mining. If BTC continues to tank, they won't be able to afford business expenses, and the ICO is screwed. Everybody investing should understand that. Any business that can't pull in enough revenue can't sustain itself. This shouldn't be news to anyone.
If you have any information on why you think IRM might be an actual scam, please share with us.