Updated: Apr 12, 2023
Stockpile cannot DRS transfer, but they can transfer to another broker for a $75 fee. The $75 has to be in your Stockpile account when you initiate the transfer.
If you do a full account transfer, be sure to download copies of all your documents as you will not be able to access them afterwards.
A popular choice is Fidelity, who can DRS transfer for free, and quickly. Fidelity will even reimburse the $75 transfer fee if you ask.
Open an account with Fidelity. When it asks you how you want to fund your account, select "Transfer from Another Brokerage". You may need to supply a recent Stockpile account statement. Fidelity will pull your shares from Stockpile. This will take roughly 3 days. From there you can follow the Fidelity guide located here.