At the moment Darling only supports running x86_64 macOS binaries.

There is on going work to make Darling run arm64 macOS binaries, but it hasn’t made much progress recently.

The architecture of your Linux machine needs to match the architecture of the macOS binary, which can support both x86_64 and arm64.

There is a research paper on this topic here: https://link.springer.com/article/10.1007/s11023-023-09644-y

A/B testing without consent is unethical. This doesn’t fly in any scientific fields, yet the technology industry doesn’t think twice about experimenting on users without consent.

I think it is mainly happening because companies don’t want to pay for user research/studies and would rather try and make assumptions about how their software is used based on aggregate data collection.

I use DuckDuckGo’s email hiding service. I have had sites reject signing up with a @duck.com email address. So services will definitely move to block Apple’s new subdomain only for aliased email addresses.