Applying to other schools while under Trojan Transfer Plan?

I’ve decided to transfer to USC from a UC under TTP. However, am I allowed to apply to other universities as a transfer as well? Or only USC? And if I get into USC as a Trojan Plan transfer, do I have an option of turning down their offer or am I bound to USC once I apply?

Apply anywhere you want. It is not a guarantee from them and it is not a guarantee from you to them. Absolutely not bound to them if they admit you a year later.