Absolutely. If the user indicates they don't want your software running anymore, it should stop.

In Zoom's case, if the user exits the app, the web server keeps running. When the user uninstalled the app, the web server still keeps running.

The user twice said "I don't want Zoom's software running on my computer and both times Zoom ignored the user's request.

This behavior is both unethical AND malicious.

Edit: wrote up more thoughts on this: https://salibra.com/p/viral-growth-doesnt-mean-writing-virus...