it is a very risky move, it is upto you if you really want to run with the risk of telling your private keys to another website in order to receive a few hundreds of dollars (if you have a big amount of bitcoins)
honestly, it is not worth it, i dont know why there are thousands of people desesperated about claiming those coins.

Monero is alright but can someone explain me what chance it stands against Zcash? I think Zcash has already proved that they use by far the most superior cryptography. And if you don't believe me, you don't have to. Just ask yourself why JP Morgan is implementing their solution and not Monero's solution in their blockchain ledger, or why Ethereum is implementing the Zcash technology and not the Monero technology? I have nothing against Monero but it looks to me like everything is against that coin, what are the chances of success when developers come up with real innovations. That is already a good proof that is reflected in the price of the currency, Zcash is far more valuable than Monero, so the market has spoken regarding that topic. Monero has to implement some real alternative to even come close to compete with Zcash. I wish the team best of lack, we need competition in the space because it pushes us to improve our service and products, I hope it does the same for Monero.