If you are in anyway involved with Riot mining, please check out the below images (links) to a rather lengthey twitter thread. If this guys research is accurate, Riot may be in serious trouble.
Generally speaking, his account is a really good follow if youre in the mining space, or curious about miners. Check it out, and dont forget to DYOR and make up your own mind.
I have small stake in RIOT and am curious to see where this goes. Especially since some firms are still giving RIOT a strong buy rating.