There’s a list of coins that coinbase has sold that the SEC considers securities on page 33 of the filing, and Bitcoin is not in the list. They list coins like SOL and DASH. I’d paste the whole list but my phone won’t let me copy from a PDF.
The SEC and Supreme Court say that "a note is presumed to be a security unless it bears a strong resemblance, determined by examining four specified factors, to one of a judicially crafted list of categories of instrument that are not securities".
If bitcoin is not a security, how could someone also create a non-security token like bitcoin? This seems very unclear