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.
In my opinion at least, the most likely reason is that Apple is refusing to notarize the software. If this is the case, people really should not be running it.