google has made it so that if you opt out of letting them train AI with your email then they'll disable features that have been present in gmail for at least 10 years
edit: apparently the article has been updated https://www.malwarebytes.com/blog/news/2025/11/gmail-is-reading-your-emails-and-attachments-to-train-its-ai-unless-you-turn-it-off
@buherator @smn to opt out, basically turn off all smart features. See this post: https://www.malwarebytes.com/blog/news/2025/11/gmail-is-reading-your-emails-and-attachments-to-train-its-ai-unless-you-turn-it-off