If OTC is bought up by Blackrock, others will have to start buying on the open market. There's no unlimited OTC supply. If OTC is exhausted, prices spike higher on open market due to exhausted supply.
1.8M btc held by exchanges. This supply is not any where to be dry, so it still doesn t answer the question
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That 1.8 may be 1.7 “owned” by other people. Just because it’s in an exchange-owned wallet does not mean it is for sale.