What makes you think they aren't? They are..
Google: https://blog.google/products/gmail/gmail-holidays-2024-spam-...
MS: https://techcommunity.microsoft.com/blog/microsoftdefenderfo...
Google: https://blog.google/products/gmail/gmail-holidays-2024-spam-...
MS: https://techcommunity.microsoft.com/blog/microsoftdefenderfo...