It's entirely possible it's a real donation. If some of you remember years ago a lot of btc was donated to Andreas when people found out he didn't actually have much btc. One individual even donated millions to Andreas. So even though people are speculating Ross sent it to himself it's possible someone in the Bitcoin space just wanted to do something nice for a Bitcoin OG and sent him a large amount.
I hope you know and understand that each person involved in any related cases like this have different story entirely, Andreas story is not the same with that of Ross Ulbricht, so we may not fully aligned every inflow to be a donation, considering what he has been accused of doing before leading to his imprisonment, am not saying there are no more generous givers again in the world, but think of two things here, the amount sent and the source being anonymous.
maybe you should read this as well reply as well form bbc.reporter.
There is very much a higher chance this donation is Ross' bitcoin than a donation from another person. Who would donate $30 million to an exconvict? This was also without an announcement and the source of the coins? Where is this from?