Every single one is a scam designed to steal your account or infect your device. The only Platinum that exists is either bought from Digital Extremes or traded from another player who bought or earned it.
While rare, you can get boosters or even built Forma, which saves you Platinum. More importantly, Sorties sometimes drop Riven mods, which are tradeable for Platinum. warframe platinum generator link
Digital Extremes does not expose a public API that allows third parties to add currency. Even internal developer tools are heavily logged and monitored. Attempting to send fake purchase requests would be instantly rejected. Every single one is a scam designed to