Yes, of course. People often start with custodial because there's a cost to setup a non-custodial lightning wallet.

If you're initially only dealing with five, ten, twenty bucks worth of bitcoin, a custodial wallet is a cheap way to dip your toes into the water. If it turns out you hate nostr and Bitcoin, you can easily cash out and call it quits.

If however, you post content people like, and you get zaps, you will probably move to a non-custodial wallet eventually. A non-custodial wallet means you don't have to trust anyone but yourself. Don't lose your seed.