I got a 2 week account suspension and 2 month trade suspension for buying the sanctum collection from steam(I have the receipt), according to DE support
"We noticed that you used term-violating incorrect payment information channels - When making purchases, you must pay the official price for that product in your region, and you must make a purchase from an official source, not an unauthorized third party. As a result of the aforementioned violations of the terms, your account has been suspended from access to the game for two weeks and has lost access to the trading system for a period of two months.
We need you to comply with the Terms that you agreed to and use the correct and legal payment information when making purchases. If we find that this account continues to use term-violating incorrect payment information, we will have to permanently ban your account from the game."
so yea DE will ban you for switching regions