It survived because IMO it is really the best broker for retail, period.
They are way ahead of the curve compared to the competition. Some brokers are catching up, but so far IB still leads.
Superior technology platform. Even had 2 factor authentication back in the days when other brokers just had a simple web login and trading tool. They have desktop and mobile trading apps when other brokers are only starting to get into that game.
They have superior market access. Global access in fact. You can trade stock, options, futures, FOP, etc - of products around major world markets. This is seriously game changing. No other retail broker as of yet has this. Where else can you hold stocks, stock options, CME futures all under one roof? And then go trade the Hang Seng/Nikkei at night on that same account? Maybe you're bullish Lloyd's Bank in the UK, so you can go buy LLOY direct on the LSE instead of LYG on the NYSE as an ADR. They're like a prime broker for retail.
Superior commissions pricing (although they are getting expensive quick) for trades, particularly options commissions. Great margin loan rates.
Everything about IB is market leading. I'm not aware of any other competing broker even close to what IB offers.
ha. I can see you like IB platform very much.
When I first used it decades ago, it was instant hatred.