This really highlights quite how scammy these vehicles potentially could be. Who's forcing SolidX to actually buy real BTC with the $1million dollars investment capital they're selling? At least with the less scammy Bitcoin exchanges, you can withdraw real Bitcoins to prove that actual BTC trading has taken place (well, at least some of the time on some exchanges. "People's" Republic of China, I'm looking in your direction)
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If people are fully realistic, then it won't have any impact on the market.
I'm seeing something different. What if the SEC approve a Bitcoin ETF whose operators promise to use it not as a genuinely intended investment vehicle, but as a propaganda tool to troll Bitcoin (and it's independent market price) with? Not implausible IMO