I'm not sure that follows. What's more, if people generally use that reasoning, and EFF is wrong (or lacked due diligence in such an estimation), then people will now be able to cite both SIAI's and EFF's actions when using such reasoning.
Perhaps you weren't aware that EFF is a "digital rights advocacy and legal organization"? If we can imagine that Bitcoin might have legal issues, how could that have escaped the people at EFF? On the other hand, SIAI is hardly known for its legal expertise, so the fact that it accepts Bitcoin offers little additional evidence for Bitcoin's legality.
Can I claim vindication on this matter now? EFF now says:
...
We don't fully understand the complex legal issues involved with creating a new currency system. Bitcoin raises untested legal concerns related to securities law, the Stamp Payments Act, tax evasion, consumer protection and money laundering, among others. And that’s just in the U.S. …
We don't want to mislead our donors. When people make a donation to a nonprofit like EFF, they expect us to use their donation to support our work. Because the legal territory around exchanging Bitcoins into cash i
Now you can donate to Singularity Institute using Bitcoin.
Currently Bitcoin mining appears to be profitable as only bubble economics can be. Already some Less Wrong users have purchased GPUs and started mining Bitcoin. Please consider sending some Bitcoins to SI at address 1HUrNJfVFwQkbuMXwiPxSQcpyr3ktn1wc9
2014 Edit: Please donate Bitcoin by using the Bitpay link on MIRI's donate page. Thanks!