Onelink allows you to set redemption rules to ensure it is not misused.
In domain rules, you will get 2 options.
"Anyone with the link" can redeem.
"Only specific email domains" can redeem.
Selecting "Only specific email domains" option will prompt you to enter the domains. Onelink supports entering multiple domains.
"Limit the redemption to" allows you to set how many recipients can redeem the gifts.