Adding a sub-tag will simply move the current 21700 man_made=surveillance elements without subtags in uncertainty. I still think that a (public) webcam could be tagged differently from a CCTV because it's not the same purpose and not the same legislation even if it is a camera and may transit throught the net. One is public, the other not. May I suggest: man_made=public_webcam website=* ('url' is deprecated in the wiki)
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