So apparently Droplets are Dangerous

 One more thing: droplets have ALWAYS been dangerous because they are executables. If you download them from an untrusted source you could have got a virus or much worse. So stopping sharing may be a good idea.

Since Catalina, any executable not made on the current system needs to be "notarized", which is a special kind of signature and virus check combined, involving becoming an authenticated Apple developer, and sending executables for signing. Generally this is done as part of the build and it may be impossible to send off an executable that someone else created - this is by design, all part of absolute accountability to an authenticated developer.

Modifying a "template" executable isn't possible, because the signature verifies everything is unchanged.

So, yes, systems that make executables for you are essentially useless for sharing with other people now. Apple very much designed things that way.

As a droplet is an executable, a program (.app on Mac, .exe on Windows), it could contain or do anything, so security settings and AV software may block it. In recent years with each release of a new Mac OS, security is getting tougher and users may have to jump through more hoops to "whitelist".

You can send them the action and instuctions for creating a droplet on their system, which will hopefully overcome the issue. This will give them the option to use the action as either a batch or droplet.

https://helpx.adobe.com/photoshop/kb/troubleshoot-photoshop-droplets-windows.html

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