Think that all those projects use Ethereum (not sure about all of them, but know that Aeternity and Enigma firstly listed as ERC20 tokens) for ICO and give tokens to buyers, and trading starts for ERC20 issued tokens. And here we have native coins, not ERC20 tokens.
I don't see a problem to create ERC-20 placeholder that is pegged 1:1 with real DNA just to allow it being traded on big exchanges safely (if it's not safe with real DNA now - which i doubt). You could exchange your real DNA in SC for ERC-20 DNA. Just like we have ERC-20 BTC or BEP2-BTC available on binance dex. It is not difficult.
That sounds cool.