There are no limitations on the amount you can earn. The more people earn through staking/yield farming activities on DeFiato after signing up using your code, or clicking your referral link, the more payouts you’ll receive.
You can share your codes as many times as you like. To keep track of the codes' performance, and see how your referral network is growing, you can access the Referral dashboard under your account page. Read more details here.