The fans by far.
DC gains from this. He was never going to beat Jones, think about it- if he couldn't beat Jones partying on weed and coke he ain't beating him sober on steroids, (or clean or ever) now he doesn't have to.
Who knows what the fuck is going to happen but in all likelihood he gets to keep defending which strengthens his claim as a legit champ... Rather than lose the belt and probably retire. And he will get paid. If he is smart he doesn't fight, takes his show pay, then takes another headlining fight in 2 months and gets full pay for that + show pay for 200.
Jones is a fucking idiot but that isn't news. But that said he is already a 28 year old multimillionaire. If his wife/baby mama is even slightly intelligent she will put money away in trust funds so Jon cant blow their college funds.
The UFC will take him back, he is a huge draw and generates more press than anyone except MAYBE Conor (but if Jones continues to pull scandals ...)
It is his first PED instance, what is that, 1 year suspension? So he stays on track at 1 fight a year.. Which is his normal pace. He loses UFC 200 pay, but like I said he is already a multimillionaire, he can afford enough weed to get through this.