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I have been using postimage.org, free, links fine, no ads or spam.
I'm not 100% sure how PB monitor your use but reading something earlier it may be that if you copy the IMG tab to get your link it will pick that up. If you copy the direct link and use the forum to give the IMG and paste your link between the two it may not register the use.
One poster on the "Model Engineer" site has suggested Postimage, I'v looked at it briefly, and must have another look.Ian S C