It's very intrusive in the sense that it runs a PoW challenge, unsolicited on the client. That's literally like having a cryptominer running on your computer for each challenge.

Each one would do what they want with their server, of course. But for instance I'm very fond of scraping. For instance I have FreshRSS running ok my server, and the way it works is that when the target website doesn't provide a RSS feed ot scrapes it to get the articles. I also have other service that scrapes to get pages changes.

I think part of the beauty of internet is being able to automate processes, software lile Anubis puts a globally significant energy tax on theses automations.

Once again, each one it's able to do with their server whatever they want. But the think I like the least is that they are targeting with some great PR their software as part of some great anti-AI crusade, I don't know if the devs itself or any other party. And I don't like this mostly because I think is disinformation and just manipulative towards people who is maybe easy to manipulate if you say the right words. I also think that it's a discourse that pushes into radicalization from certain topic, and I'm a firm believer that right now we need to overall reduce radicalization, not increase it.