If it won't require me to invite friends into it and I know I'm early enough, I would if I have the money to spare.Drop in some cash, take it out along with interests, and the leave without looking back. The internet has made this a lot easier now, though I think it becomes harder to game them. A relative keep on insisting that I deposit some bits in btcriver.com, swearing he made money out of it. Just so he'd stop talking about it, I deposited a small amount and then just disregarded it. Now he's complaining that it won't let him withdraw again. I've been tracking the money I deposited there and I redeposit the profits. I'm waiting for all of the deposits to mature now. If their scammer system only tracks how many times money has been deposited to an address and it allows people to get bits at least once, I might still be able to get my money back.
Yes, there are some bitcoin mlm scheme/scams which do not require inviting other friends(person). You could create dummy accounts for you and invest via them as your referrals. This way you are putting all your money and not inviting other people.
It is possible to get money back from MLM scam if :
1. you enter in early stage
2. You don't reinvest your returns from scam.
This way it is possible get money out of MLM scams.
When it comes to MLM, some people become very possessive about their legality and defend them as legit.