You’re doing that thing again where you imply there is no middle ground between a few shares and a billion dollars worth of shares. It’s a dumb straw man.

Elon musk saying he would sell his shares because he was backing out of an agreement to purchase those shares at an inflated price is obviously going to drop the price. This is not the same thing as a random shareholder who happens to own stocks and wants to divest some.

If you want to sell all your shares for X, you’d be an idiot for not selling some of them for more than X. This is not difficult to understand.

Acquisition offers for less than market value are extremely rare, absent non public information. They are called takeunders. They generally only happen when a company is on deaths door. Which lyft is not. It would be seen as really dumb to offer less than market value in an acquisition bid. Stop making up rhetoric as if this were a normal reasonable thing to do. It’s not.