'Direct Register Shares' - Both GME and AMC use Computershare, as does Apple, to manage their directly registered shares. Yesterday I initiated XFERs from Fidelity and Schwab to Computershare. Once complete in a few days, Computershare will hold specific shares in my name.

With a regular brokerage, they make a book entry saying that you own a share of stock that they keep in a shared pile. (How do we know?) With Computershare, they have actual shares attached to your name.

If/When the Jenga tower collapses, I'm confident that I'll be holding legitimate shares that can be sold for many tendies.

Not financial advice.
More info available on the top of the Reddit Superstonk board.