The referral rewards have always been decreasing. We've outlined from the start that the amount of tokens users receive for referrals would decrease, and once we launched it dropped to 50 per referral. The thing is that most users don't find out about Morpher from us directly, but rather from the users referring them. As a result people think they are getting 2000 tokens (the airdrop amount from 6 months ago), because it's not properly marketed.
Everyone that was on the waiting list was invited before we launched and could have claimed the amount of tokens that were available to them when they signed up. However, when we launched the airdrop reward fell again, and those that hadn't claimed could only claim 100 MPH just like every other new user.
I hope this answers some questions.