"Bitfaine, Bitmein, Bitrix" Please be correct, there are many similar names, it can be difficult to understand you sometimes.
So you think that Bitcoin for $20k was necessary just for mining companies? I guess not. Of course they took part in it because it is very profitable for them to sell equipment for higher prices(in dollars, because as I know in Bitcoin it is constant). There also were many people who invested in it in $500-$1500 who helped to advertise BTC then. Also take in mind that this huge bull run was accompanied by emission of tether, coin that possibly is not provided with fiat funds.
I should say we saw a result of complex diligence, not only mining companies