Of course, the amount of 30 ETH is a very small amount for the creator of Ethereum, and it does not constitute a large number in a large case like this, which requires senior lawyers and may last a long time, but I expect that Vitalik Buterin aims to show his moral support for the case of Alexei Burtsev, developer of Tornado Cash.
The issue is primarily related to privacy, which is an issue that has and continues to raise a lot of controversy in the United States, and it is certain that there are many figures and associations interested in the issue, and this behavior of a famous figure like Vitalik Buterin will certainly help in gathering more of the necessary financial and moral support.