I don't think the Proton developers are on lemmy, this community is maintained by enthusiasts and users. You might want to reach out to them directly.
We (reddit mods) usually read everything here, and closely work with the rest of the Proton Support and Social Teams. But we can understand that Proton is not interested (as of now) to modify their icons. So the previous answer remains.
Someone posted about this over on Reddit. This was Proton’s response:
Hello, the launcher icons are part of our design system and need to come from our Design team. Thank you for the suggestion and the understanding.
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