For the pending question "can you see who watched your reels on Instagram"', the answer is no. Instagram doesn't reveal what profiles have seen a reel, however, you can know how many views it has. It's also possible to see the number of likes and choose if you want to show this information or not.

Anyone can download your reel, unless you turn off reel downloads in your account settings or on individual reels. For private accounts: Only your approved followers can see and share your reels. When someone shares your reel, only your followers will be able to see it.

However, simply rewatching a reel multiple times does not count as additional views according to the algorithm. Moreover, a view will not be counted if the reel is watched for less than 3 seconds or if the user quickly passes by without spending enough time on it.