I'm really surprised that some folks in this thread are blaming King Neptune and equate him submitting the story to an agreement of publication. They are very clearly not the same.
Most venues do not post their contract online. When an acceptance is received, it is supposed to be followed by the contract, which spells out *exactly* what rights the market is acquiring. This is true even of the non-paying markets, because there are still permissions to be discussed (such as the length of time they may display the story, a period of exclusivity, etc.) These contracts can then be negotiated until both parties are satisfied.
Besides, all kinds of things might happen between the time you submit a story and a time it's accepted (or rejected). The market might release its first issue and it's so awful you no longer want to appear there (I've withdrawn a submission for this reason.) An editor might turn out to be a jerk and say things on social media that will prompt you to withdraw your submission. Or, you might have learned as a writer that you should not submit to a market this crappy and choose not to publish with them even if they want the story.
And Neptune, I encourage you to share the market name with others, so they can avoid the pitfall of submitting there until the editor(s) change their policies in this regard.