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The Stoplight Spoiler was obtainable in Season 32: "Street Racers" by being in the top 2% when the season ended.
Stoplight currently sits at a MU of ~664. While this is partly due to extremely low demand, it still is much lower than any other "very common" item, and in fact is lower than many "common" items. Additionally, Stoplight has 16.2k total copies; once again, this is much lower than other "very common" items such as Underground (121k copies, ~2.4k MU) and Roblox R (270k copies, ~2.2k MU). Overall, while Stoplight is still fairly common to see in trading, it is rarer than "very common" would suggest, having a lower MU, lower total copies, and just a lower frequency in trading than other "very common" items, and "common" would fit it much better. Suggestion made by: @ricearoni2015
Supply is widely distributed — no single holder owns enough to register as a hoarder.