Bitcoin has a centralized development team who is focused on increasing the coin's value. By writing more efficient clients, coordinating soft forks, and curating standards, the Bitcoin Core dev team is directly supporting the asset. So why did the SEC declare it not to be a security? We could speculate as much as we want, but at the end of the day these are the hard-hitting questions that the SEC has been avoiding, and their avoidance of these questions has been bad for everyone involved.

Right now everyone is guessing why exactly the SEC considers most of the top 10 coins to be securities, except Bitcoin, with Ethereum apparently in limbo. Most importantly, it leaves companies guessing whether they'll have to wage a bankrupting 50-million-dollar lawsuit against the SEC to try to defend themselves if they launch a coin they believe not to be a security, but that the SEC later classifies as one through their opaque reasoning process.

I mentioned it in a comment above, but the SEC needs to release something like a 10-step process for determining whether a certain crypto is a security. Something that's clear enough that a company's lawyers can apply it to their products to determine without a doubt whether they are in compliance with the law.