Submit Enrollment Deposit Now?

I’m waiting to hear back on the colleges I applied to. They have their enrollment deposit due on the usual May 1st.
There was one small, private college I already got accepted to that has their enrollment deposit due now, but say they will refund you if you let them know you’ve changed your mind by May 1st. (Weird, I know.)
I want to save my spot there, but I feel like if submit it maybe it could jeopardize my other applications that are being decided on somehow, I don’t know if there is a way they could find out. I feel like it’s almost crossing over into double depositing and I don’t want to be unethical. Any advice? Thanks!

If it is refundable and has an earlier deadline, I don’t see why not to do that unless you are pretty sure you don’t want to attend.