Return on Invest: 161% per year
Normally when anyone sees that, all ponzi scheme and scam alerts should go off.
Between reinvestment and usual business a 3.88x returnon the original capital over 5 years(as suggested by the numbers estimated on the page you refer) isnt infeasible at all.
One of the worlds largest cryptocurrency exchanges, HitBTC, will trade EVN tokens after the envion ICO completes
This thing has 1,5-2 star reviews on all crypto exchange review pages.
World's largest and mediocre reviews arent mutually exclusive features.
Another aspect is that they assume GPU/ASIC mining is the future for at least the next 5 years.
If tomorrow the main coins are going proof-of-stake or proof-of-capacity, this whole project goes to the drain.
From the "main" mineable coins only ethereum has declared intention to transition to PoS and thats still without a precise ETA.
Bitcoin, LTC, Dash and their forks/clones of the SHA256/Scrypt/X11 algorithm family are years away from even initiating such transition and even if say they were hypothetically PoS tomorrow mining altcoins would still be profitable. In fact, I would like for Envion to mine alt coins at some capacity as most of the times those offer better ROI than "main" coins.
Even the fact they reached exactly 100 million dollars with this ICO starts to ring a bell now.
On the contrary, such an amount can and will lead to economies of scale that will make it easier for them to achieve their goals.