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NO! Waves is not a just altcoin! It has a cryptocurrency wallet in its platform. So you can deposit, hold and withdraw BTC in it.
But unfortunately, It is not a Bitcoin which came in this friends wallet.
Waves has a complete decentralized platform. So you can easily create a Waves token in its platform. And there is no limit including names. Because it is completely decentralized. So, some people are trying to fool people with this. They are creating token and named it a popular coin like BTC, ETH, or anything. Then sending all Waves wallet freely. And they are writing note that transactions. If you send more Waves or any crypto them, they claim that they will send back more BTC to you. (if you beat it.)
Don't believe them!!! No one send free BTC to nobody! It is over 5000$ now!!!
I agree with you. People here keep talking about waves but probably they have never open waves platform.... even once.
On waves platform there is a cryptocurrency wallet where you can also store other cryptocoins, including btc. Offcourse you have to trust waves platform if you do it, like you have to trust exchanges if you deposit on their wallets.