I found that some trades gives overnight refund instead of overnight fees.
1- Can I build a strategy to profit from it?
2- Is this refund mount constant from the day I opened the trade till I close the position, or it is subject to change on daily basis (or even convert from refund to fee)?
3- Is there a formula to calculate it? If there is a formula, is it different from one broker to another?
4- In general, why there is an overnight fee/refund? I mean what does the broker do in the night to be paid for CFDs?
Note: I didn't use leverage at all (as in the screenshot)