I think Arc is a very interesting browser. I’ve tried using it on and off, but I have read a few blogs/posts that suggest it’s not very privacy forward. One of my biggest pet peeves with it is that it’s built on Chromium, and it requires you to have an account/login. Here’s a great privacy review, my apologies if you’ve seen it already: https://adam.kostarelas.com/blog/arc-browser-privacy-check/