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A very simple and easy way to pretty much guarantee an image doesn’t contain unnecessary metadata, can’t be uncropped, etc. is to first convert it to JPEG and then run it through an image optimizer (like ImageOptim [1]). Don’t use cloud software for any of this — do it all locally.
[1]: https://imageoptim.com/mac
This reminds me of something similar from the guy who implemented AVIF in Firefox. He gives a talk about the implementation [1] where he talks about the CLAP privacy problem. Basically the spec adds a field that allows for cropping of the image, but the binary file would still contain the original. This would lead users to believe some image data was deleted when it really wasn't. I always thought he spent a lot of time and effort on this for little gain, but now I'm starting to think it was worth his effort.
[1]: https://youtu.be/BUkRlfkv2D8?t=2199
And the related GitHub issue: https://github.com/AOMediaCodec/av1-avif/issues/188