Bitcoin "will not be traded on Margin"
I think this is very important for the proper development of Bitcoin as "decentralized", "people's money". Margin trading is turning Bitcoin into a kind of fiat currency or one that can be manipulated like fiat.
Margin trading is a relatively new phenomenon in the stock markets made possible by "electronic shares" rather than the real, tangible, paper shares your grandparents and great-grandparents kept in their attic. Real shares cannot be "lent" out on margin without the owner's consent. All of your brokerage shares can be lent out for profit by your broker - you receive none of the profits and they use your shares to help people bet against you.
https://www.coindesk.com/bakkt-ceo-crypto-trading-platform-wont-support-margin-trading/