When you put your money in cryptocurrencies, the miners will control your life.
If the miners decide to switch to another altcoin you cannot sell any of your coins - no matter which coin it is, even Bitcoin. If they reduce their efforts prices to transfer becomes extremely high. If you have a lot of your money in cryptocurrencies, the miners will become your new slave masters
Its a little bit true that miners are trying to influence the growth and existence of a crypto coin but its not 100% possible in bitcoin.They tried their best to control bitcoin,block segwit activation but they failed.That's why,they joined hands with Roger ver and supported to mine BCH instead of BTC.They are trying to influence bitcoin also,but thanks to satoshi for his decentralized model,they are not fully successful.