I read white paper, and it says here that new coins are constantly appearing in the fund, which in one way or another increase the efficiency of profit achievement.
it is absolutely true. But basically, of course, these are constantly growing assets and those cryptocurrencies that are at the top of the rating in the Coin Market Cap. For example, this is Bitcoin, Ethereum, Ripple.
except for those that you listed, it can also be Monero, Cardano, Litecoin and others. As for fiat money, it's a dollar. Did you know that dollars are also present in this trade?