Now using it further from there might indeed be problematic... but also a champaign problem.
The risk to them comes when they try to spend the funds later. They'd always have the option of dumping them on something unconnected to them for bragging rights with relatively low marginal risk.
If those were to be dumped on the open market, it would eat a lot of USD.
Also if you can send BTC to some wallet, why couldn't you send it to another wallet where you indeed have access?
Why the expenditure? Someone above basically said marketing -- marketing Bitcoin so headlines hit the masses and maybe get some sort of ball rolling again. I think it's safe to assume there is a larger plan in the works and whomever responsible has played their hand and now hopes the cards fall as they projected, for whatever ends.