"He is suspected of involvement in concealing criminal financial flows and facilitating money laundering through the mixing of cryptocurrencies through the decentralised Ethereum mixing service Tornado Cash."
This does not read as "all he did was write some software."
Yes, he might have written software, but if it was with the purpose of money laundering, for example, and that can be proven, that's not just writing some software.
We do not have enough information to decide either way, but what information we do have now (which has yet to be verified, of course) is that he did not just "write some software."
"He is suspected of involvement in concealing criminal financial flows and facilitating money laundering through the mixing of cryptocurrencies through the decentralised Ethereum mixing service Tornado Cash."
This does not read as "all he did was write some software."
Yes, he might have written software, but if it was with the purpose of money laundering, for example, and that can be proven, that's not just writing some software.
We do not have enough information to decide either way, but what information we do have now (which has yet to be verified, of course) is that he did not just "write some software."