Quran verse 33:33 was a direct commandment to the Prophet's wives only. So why do people say it is supposed to be for ALL Muslim women?

As the title says. I see it so common (especially on Salafi websites). The verse about women needing to stay at home was a direct command to the Prophet's WIVES. If the verse said "all believing women", then it would make sense. But the verse does NOT say that at all. So why are people purposely misinterpreting the verse?