If people claim that they deposited USDT and bought WBTC or something else (On different chains, Binance chain, for example), Do you think it should be counted?
There's Bitcoin, and there's scammers trying to sell their own made-up token as Bitcoin. So no, I don't count them. They're meaningless.
People are still buying them and holding them. WBTC Marketcap is $4,849,290,817 (at the time I am writing). Not sure how its rates work. WBTC's circulating supply is 245,480, and no Max Supply limit exists. That means, The creator can increase the supply limit to infinite, and all the money will vanish in no time. He can create unlimited tokens and sell them since WBTC is already listed on Top CEX and DEX. I don't know if I am wrong.