What kind of service would be best at a URL that suggests malevolence?

I bought evil.app a few years ago after Google acquired and opened up this HSTS-only ccTLD, but forgot about it until now. I've been thinking about building a simple service to allow enterprises to run phishing campaigns but it seems like this is done by a number of vendors. I fail phishing tests all the time at my employer (I am a distracted guy) so this seems like a reasonable idea, but I think maybe a different angle might be better.

You always see these snippets of documentation that refer to "evil.com" or "evilapp.com" in reference to malicious computer actors, so I thought it might be even useful as a developer resource or even as a kind of API-gateway for other domains to use as a catch all for their own phishing campaigns/internal scans. This space seems super crowded but I think it's a huge threat to web security, and was curious what this crowd thinks.