Yes- Photobucket should have a "grandfather" provision that photos hosted under the free conditions continue to do so, and those uploaded above the limit be blurred if the fee isn't paid. US$7 per month doesn't sound much, but it's AU$123.96 pa, which is a fair bit to pay to see some photos.
I hope imghostr don't go down the same road. If they decide to charge, they should abide by their own terms regarding free access.