https://markets.businessinsider.com/news/stocks/robinhood-sec-investigation-high-speed-trading-firm-deals-market-makers-2020-9-1029557810?utm_source=notification&utm_medium=referral
Do these deals benefit the retail traders?
No country has ever depreciated their currency with the result being economic success. Look at the record of South American countries with their successive devaluations.
TD Ameritrade is in the process of being merged with Charles Schwab.https://www.thinkadvisor.com/2020/08/06/what-to-make-of-schwab-td-ameritrades-integration-plans/