Freebets are offered as packets. So for a $7 freebet, you will be able to only place a $7 bet. But if it's cash, you can place a bet upto any meaningful decimal place. So for example, if you wish, you could place a bet of $0.56
$7 is the amount I won after betting the freebet, more precisely $7.65, is this still considered as a freebet? but actually it doesn't matter because I enjoy trying this bookie