I have mixed views on arbitration, it does lower costs, but arbitrators rarely see things from the consumers' perspectives.

Here are the instructions for opting out, which I will be recommending to all my friends (followed by a link to the form):

You can choose to reject this Agreement to Arbitrate (“opt-out”) by mailing us a written opt-out notice. For new Venmo users, the opt-out notice must be postmarked no later than 30 days after the date you accept the User Agreement for the first time. If you are already a current Venmo user and previously accepted the User Agreement prior to the introduction of this Agreement to Arbitrate on May 23, 2022, the Opt-Out Notice must be postmarked no later than June 22, 2022. You must mail the opt-out notice to PayPal, Inc., Attn: Litigation Department, Re: Venmo Opt-Out Notice, 2211 North First Street, San Jose, CA 95131. For your convenience, we are providing an opt-out notice form you must complete and mail to opt-out of this Agreement to Arbitrate. You must complete this form by providing all the information it calls for, including your name, address, phone number, Venmo user name, and the email address(es) used to log in to the Venmo account(s) to which the opt-out applies. You must sign the opt-out notice for it to be effective. This procedure is the only way you can opt-out of the Agreement to Arbitrate. If you opt-out of this Agreement to Arbitrate, all other parts of the User Agreement will continue to apply. Opting out of this Agreement to Arbitrate has no effect on any previous, other, or future arbitration agreements that you may have with us.

The form:

https://help.venmo.com/hc/en-us/articles/360062640153