but being able to set a referrer is only possible for a limited time.
So I can set my referrer for a limited time, but what about my referral link ? I mean if people use my referral link then I should be their referrer and that should be possible always ? And what is the timeline for setting my referrer ?
yes for referring it'll be lifetime and you'll be able to refer forever from now on, since people won't be able to set a referrer after the sale launches that's when it'll be removed to set a referrer then to keep it fair and give pre-registered accounts a chance to set a referrer til then.
The option will be removed before the sale starts, we'll announce it in time.