Any chance of giving just one spell that we invent as part of our starting spell collection? It seems reasonable to at least own one thing that we invent. Don't want to submit my cool mind-blowing spell if someone else is going to own it
Wrong mindset.
We are building this game together. If you approach the spell creation part with a protective attitude, that's a mistake.
That said, chances are that you will get a couple of your own spells rather than those of other people.