It already happened to me twice, and possible to thousands of other people around the world.
I got an email with a link, courtesy of Amazon, that told me to look at what happened that day in 2003 (once, the other time was 2002, I seem to remember). I duly clicked on the link (the Amazon source looked fine) and indeed I was shown a few photos that I uploaded many many years ago on the Amazon account that, at that time, provided unlimited space, for free, to store my photos.
What a nice surprise to be reminded of those times!
Yet, after enjoying the memories a doubt started to creep in: how could Amazon still have my photos since I received some 6 years ago a message indicating that the photo storage service would have been discontinued (I could opt for a pay service) and I would have to download my photos since they would no longer be accessible after a 30 day grace period?
I chose not to use their pay-service and downloaded my photos to a different cloud. I assumed, in doing so, that my photos would be deleted from the Amazon cloud but clearly my assumption was wrong and my photos, although I no longer have rights to see them (nor delete them!) are still there available to Amazon. I am not particularly concerned of this, but still it is a clear indication that my ownership of data is just a figment of my imagination: the ugly truth is that whatever goes in the cyberspace, most likely is beyond my control, in spite of all GDPR talks…