Does the 7-Zip author still refuse to digitally sign or even provide hashes of the official downloads? It's an extremely weird flex, he thinks it's a frivolous waste of time or something.
He's always been an odd one, for a long time he refused to enable even basic hardening features like ASLR and DEP because they made the executables slightly larger. He eventually relented on some of those, but last I heard the more advanced mitigations like HE-ASLR, CFG and GS were still disabled.
Do people even double check installers are digitally signed? There's so much open source stuff out there that is not digitally signed, most people might not even notice.
I migrated from 7-Zip to NanaZip, a fork with modern Windows features that the original developer refuses to implement.
https://github.com/M2Team/NanaZip