On exchanges 1, it is 2.5% per year.

It is 3.89% per yearnon exchange 2.

Assuming I have $1500 of bitcoin and I borrow $3500 with it.
I will pay $136.15 yearly.
It is 0.00052% on exchange 3.

Which look small but let us do the calculation.
0.00052÷100×24×365×3,500
$159.432 yearly
I know I should go for exchange 1 which is $87.5 yearly.
You can see they the charges are different which means traders should compare exchanges before going for margin trading, but just only reputable exchanges should be used.
My main question is that I noticed the funding rate on the exchanges is changing, what if the price of bitcoin is increasing significantly, will the exchange increase the charges?