Each basket holds one tokenized stock and the memes launched against it. Membership follows the conditions on the tracked list, not anyone's opinion. A basket only opens once enough tokens hold those conditions.
A token that stops clearing them is retired: new deposits no longer include it, and that is the whole of it. Nothing gets sold on your behalf. You keep your claim on a retired token and receive it, dead or not, the moment you leave.
Most holders will buy the basket token in one swap and never do any of this. The path below is how a deposit works. It is what keeps the price tethered to what the basket holds, and arbitrage is what runs it.