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Don't count on it.
Unless the plat is actually acquired legitimately DE may just end up nuking it and force you to pay whatever negative balance you get on your account in order to log in or just straight up ban you. This also happens if you sell stuff in game and the plat you received for an item gets nuked due to having been acquired by someone using a chargeback on their card or similar as DE will simply remove the plat from the game.
Best go through the legit sites for this, so either warframe directly, steam or the various console stores depending on your platform.
It doesn't matter if the plat is legitimate or not. Any large plat unbalanced trade (e.g. thousands of plat for an ammo drum) is dangerous because it looks like someone is selling the plat for real money, even if the plat was completely legitimate. Rivens are also a problem because their value varies widely.
Okaaaaaay thanks a lot for the feedback man