You can set up the referral app flow to allow non logged-in customers to join your referral program.
Go to Apps > Bloop: Rewards & Referrals > Referral Program
Under Referral App Flow Configuration, please select "Allow all customers: guests and logged-in customers".
This app flow will allow all customers in your store to join the referral program/receive rewards without logging in or creating account.
Note: We do not recommend this flow because it could cause some fraud problems if your customers know some technical knowledge.
If you have any questions, please contact us via sales@bsscommerce.com for further assistance.