I would go further and not upload anything that isn't encrypted to cloud storage services. It is extremely likely that those "services" inspect your files.

They do, unquestionably.

https://www.thetimes.com/world/article/google-bans-father-ov...

> Mark, from San Francisco, had noticed swelling in his son’s groin and used his phone to photograph the problem to get an emergency appointment in February last year. He shared the pictures with a nurse so that a doctor could review them.

> However, Google’s artificial intelligence system used to detect child abuse flagged the image to the police and Mark, a software engineer who asked to be identified by only his first name, was investigated and lost access to his Google accounts. He was exonerated by the police in San Francisco but his Google account has not been reinstated.