The thing is, there was a photo on my website that I took from Adobe Express, it was in the free photos section. Seven years later, the owner of the photo informed me that I had infringed on his copyright. How could this have happened?
Adobe Express is not that old. Maybe you used Spark, but Spark did not come to my knowledge with "free" stock images. And free does not mean that you can do with the image what you want. Adobe express images come with a limited licence. The images can't be used outside of Adobe Express, without being licenced separately. https://stock.adobe.com/license-terms#limitedLicenses