Out of the box it can play audio in the background, and now that extensions are available you can block ads as well. You don’t really need constantly updating 3rd party clients or questionable firewalls anymore if you just want usable youtube on a phone.
DDG has a browser, and it’s based on Chromium which is from Google, so this is a shit take. Do not use Chromium based browsers if you value privacy or ad blocking features.