“Suspicious Generosity” is not a phrase that is part of any official enforcement status information from Forza Support. I suppose it’s possible there was a browser translation here, but in any case there’s no concern about gifting all your garage cars. We encouraged that activity during the holidays without any enforcement issue.
Refer to the Conduct and Rules for enforceable issues and the link to check Ban History at Forza Support if you have any concerns about your account.