Privacy
A still that carries a short clip and its own metadata
Live and motion photos bundle a video segment with the still, and uploading the bundle uploads the seconds around the shot.
Guides on Privacy: Who could see it, how, and what each path costs to close, Soft delete, backups, caches and logs, Sometimes, and the policy clause that says so is easy to miss
A Live Photo or motion photo carries a short video alongside the still, so uploading "the photo" can also upload the seconds around it, with their own metadata. Apple's Live Photos support page says the iPhone "records what happens 1.5 seconds before and after you take a picture." It is not one frame.
What the bundle actually contains
Apple's Live Photos link a HEIC still to a MOV clip through a shared content identifier. Android's Motion Photo format documentation describes "a primary still image file, JPEG, HEIC, or AVIF, with a secondary video file appended to it," located through XMP metadata. Either way, the clip carries its own metadata track - timestamp, sometimes location - independent of the still's own fields, and stripping the still's EXIF does not touch the video wrapped alongside it. The clip also shows movement: hand position, surroundings coming briefly into frame, whatever happened in the half-second either side of the tap.
What happens on upload
Most upload widgets, including rating tools, ask for a still image and either reject the Live Photo format outright or - more common on mobile browsers - silently take the still frame and discard the motion component before the file leaves the device. That is a convenience, not a guarantee, and it depends on the browser and the widget rather than on you. The safe assumption is the opposite: treat "Live" or "Motion" as a label meaning there is more in the file than the frame you saw, and convert to a plain still yourself before uploading anywhere, including to Rate Cock. On iPhone, Apple's own instruction for sharing only the still is to tap LIVE in the upper-left corner of the photo first; on Android, most gallery apps offer "Save frame" or a still export separately from the motion file.
Where this differs from a duplicate photo problem
This is not the same issue as the extra frames a burst leaves behind - those are separate files sitting in your library. A Live Photo's video component travels with the single file you select, which is what makes it easy to send along without noticing. Scoring itself is unaffected either way: a model reads one frame, and how a frame becomes a score is a separate question from what else rode along in the upload. Whether a tool that does accept the whole clip should score a frame or the video itself is a different design question, covered in video frames vs still photos for scoring.
Where this comes up elsewhere
A commissioned human review works from whatever you send, and a judge seeing unintended motion frames is a etiquette question rather than a privacy one - what belongs in a submission to a human judge is covered on the site that owns that relationship. Photo standardisation for repeat testing has the same interest in a clean, single frame; Penis Rater's notes on preparing a submission touch the same ground from the comparison side. None of this affects a measurement taken with a tape rather than a photo - Measure My Cock's method does not involve uploading any file at all, still or moving.