Bitcoin rate now is 2k$+ That's reason why the fees is so high, every fees has been deceided by the Bitcoin network 
You can use coinbase I saw their fee very low
Not sure what fees you're exactly referring to, but Coinbase requires people to include a fee of +0.001BTC for external transactions. That's exactly the reason why you see a lot people complain. You can use coinbase I saw their fee very lowOther than that, the price definitely plays a role, but it is mainly related to the high level of spam going through the network at the time an attack takes place.
It might very well be coming from the side of the miners as they definitely have a motive. But that can also be said about the Bitcoin Unlimited side. Whatever it is, it significantly influences the fees.