If ETH2 is moving to Proof of Stake, why are some exchanges letting you stake ETH already?

I thought one of the changes of ETH2 is that it will be purely proof of stake but we are still on ETH1 which is proof of work. Why are you able to stake on exchanges like Coinbase then? submitted by /u/GhostofBlackSanta [link] [comments]
http://dlvr.it/RykQ0d