Suggestion:
When user shares splat, include option if they want to set a time limit on how long they want their link to remain available before it cannot be accessed anymore. If user chooses to set their link to expire after a certain time frame, the shared splat becomes private after the link expires.
Why this is useful:
For situations where user does not want the link to remain publicly accessible after a certain period of time. Example, if teachers share splats for students to interact with only during a class period (maybe for a test or exam) or for a class semester time period.