Rigorous provenance is vital when it’s vital.
Looking back now it was sort of a blessing in disguise since because of that letter, the next time I started a company I took the time to learn the simple process of taking a digital photo and converting it into to an SVG and have done that for all of my companies I've started over the years.
Creating an SVG logo or clipart from a photograph isn't difficult to do, especially nowadays with Inkscape and actually provides a sort of CMA proof of work to defend against copyright trolls.
Apple sued Prepear because Prepear's logo looked too much like the Apple logo [1]. Prepear spent lots of money to defend themselves and finally made a small change to the logo to make Apple happy.
I think the lesson is to be prepared to change icons and logos swiftly when another legal entity sues for copyright or trademark violation.
[1] https://9to5mac.com/2021/02/09/apple-and-prepear-reach-an-ag...