Futures ETFs and spot ETFs are as far from Bitcoin's intended purpose as you can get and they serve to make banks more money while giving them more control.
I know that ETF's aren't actual Bitcoin by any means but they are somehow helping Bitcoin to grow. You don't own a Bitcoin when you own an ETF but it's value will always be close to the value of Bitcoin. If Bitcoin goes up then the ETF holder will also make profits from that upward movement and if it goes down then ETF holder will also face losses. I think those ETF's are somehow win-win situation for every holder of Bitcoin. The investment companies behind those ETFs will spend a lot of money to advertise their ETFs and such advertisement will also indirectly promote Bitcoin to wide audience.
It is the interest of many to use BTC as more of an investment option, rather than as money to be spent for payments and transactions. Whatever be the case that has led to the approval of the ETF, it will at least place a target on money launderers and criminals who use BTC for neferous activities. It would allow more countries make move to adopt and regulate crypto currency with more interest in future BTC implementations of investment benefits.