This day marks the beginning of the first ever “utility token” ICO, called Mastercoin (later rebranded as Omni). J.R. Willett's fundraiser raised approximately 5,000 BTC by promising a protocol layer on top of Bitcoin. Mastercoin pioneered the ICO model that would later spawn thousands of scam tokens during the 2017 bubble, collectively draining billions from retail investors. Bitcoiners mark this date as a cautionary reminder of why Bitcoin's lack of a pre-mine, ICO, or “founder's reward” matters.
Wikipedia: Omni Layer (Mastercoin)