Extremely unlikely but important hypothetical question?

Hypothetical but extremely unlikely but if someone actually attempted to buy 600 billion USD in BTC and ETH and the major StableCoins through several OTC brokers globally which is roughly 22 percent of the supply could they do so gradually over a extended period of time for example a month and what potential impacts would this have? Could market impacts be minimized by using algorithms and liquidity pools and sourcing liquidity etc to the point where the market impact is minimal?