The issue I have with this kind of service is that they can, and will be discontinued in the future, and the URLs can potentially be redirected to something malicious.
I have no doubt about your good faith, but my experience is that it happens[1], so I’d rather not rely on it at all if I can avoid it.
On a forum I migrated, many images were hosted on a third-party service that overrode all image links after a few years
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