I realized that we provide an option called "Flatten PDF" [1] which does exactly what you described: flatten everything including text into a big image per page. It makes all text unselectable and also produces a very large file.
This feature was introduced for printing consistency as PDF viewers and print drivers may render things differently. But I don't think it's selected by default, so users have to consciously tick it to make it happen.
But it seems that our support team sometimes presents this feature as a way to solve user issues, so maybe that's the reason.
This feature was introduced for printing consistency as PDF viewers and print drivers may render things differently. But I don't think it's selected by default, so users have to consciously tick it to make it happen.
But it seems that our support team sometimes presents this feature as a way to solve user issues, so maybe that's the reason.
[1] https://www.canva.com/help/download-flattened-pdf/