I do consider this, and it's relevant. Were the SEC to be considering a new regulation, prior acts would be exempt from that. However, they are just stating that they have authority to regulate securities, and point out that cryptos that perform as securities are subject to their authority.

Steem is, because voting is based on SP holdings. It is a security. Since there is no new regulation, the SEC can apply it's authority to acts prior to this announcement.

That means that premining the Steem and then offering it to the public is a violation of the SEC's rules, and those that have done so remain under threat of SEC prosecution in the USA.

This is an issue that Steemit needs to address, not only regarding premining, but also looking to reduce the entangling regulations that can impact users. I'd prefer to avoid such entanglements. I reckon most folks would too.