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How can online trading platforms be trustworthly? 
Most investors vote with their wallets. I expect ZERO glitches from a trading platform. If someone was actually causing trades to fail maliciously, their reputation would immediately suffer and their business would dry up over night.  You can't just play dumb and not respond to a button click. I can watch and replay the traffic I'm sending out to their server and see if they are responding to verify this. If their system goes down and has no redundancy, that is their fault and opens them to lawsuits. No trading platform could withstand scrutiny from its users if it was dishonest in the scenario you imagine.