Recommending (and running) `xattr -c` can be extremely dangerous. I would suggest withholding Mac releases until they can be distributed/run safely.
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It feels extremely suspicious, given that I download lots of other popular utility software from independent devs and I've never had to do that before.
I don't know why this app would need Apple's signature in the first place, seeing as it's not distributed through the app store. Is this like how you need to pay for a certificate to make the "are you sure you want to run this" prompt look less scary?