digging around in the help section on udio I found this.
suno does not grant you ownership on what you create on the free plan but does on the paid plan.
udio looks at it a bit differently and does not claim ownership on your creations but leaves you the burden of proof for full ownership on the free plan, as far as I can tell they do not have a different take on ownership to their paid plans and only upgrades on the features. I find this interesting as obviously there is not a lot of copyright holder precedent for Ai music yet, (ie how is it trained, does it train on user input/output - i would say yes they do) but I wonder who has set themselves up for less trouble for copyright claims going fwd. it's funny that the 2 biggest Ai music companies (so far) have an opposite approach to ownership.
if i was to use suno going fwd I would probably go straight to a paid plan just to avoid any videos I use it for being muted. (great marketing Suno!)