Drift is the kind of tool people tell each other about, so telling somebody should be worth something to both of you. Share your link. When the person you sent subscribes, two months come off their subscription and two come off yours.
A referral that pays out at signup buys email addresses, and a referral that pays out on some usage milestone buys a minute of somebody’s time. Paying only when real money moves is the version that cannot be gamed, and it means every reward Drift hands out was paid for by somebody choosing to subscribe.
Cash referral schemes work when the person sharing has an audience they are already monetising. Most people telling a friend about Drift are not doing that, and a payout threshold they will never reach is worse than no reward at all. Two months is something everybody can actually use.