I’ve been using Copilot for weeks now. It’s definitely useful for building upon what you already wrote. It’s very effective for single lines, but I don’t trust it to come up with entire functions. I tried, but obviously YMMV.
The licensing is definitely a problem, but I think that Copilot only highlighted the issue - it didn’t create it.
The concept of software license looks pretty fragile to me. You can own software but you can’t really own PL statements.
You can own the whole but you can’t really own the atomic parts that make the whole.
If so, closed-source is just a way to make you work really hard to achieve a result that someone else already achieved by means of obfuscation and secrecy. I’m not sure where open-source stands. Maybe it’s just a social contract.