I've used
hotlinkfiles.com a fair bit. It has the advantage of zero rigmarole regarding linkage and (obviously) zero T&C concerning hotlinkage.
On the negative side ... it has on occasions proved to be very slow and clunky for uploading and once or twice it refused to agree I even existed.
But back to the pros, I have had almost no instances of slow loading of hosted images.
There is a monthly bandwidth limit on free accounts, but no limit on paid accounts. I have not needed a paid account and so cannot comment on that.