The creator tier ($99.99/mo) lists "15 seconds" as a perk. Does this mean the maximum video length is 15 seconds?

One of the founders here! No it's not. The max video length is up to 2 min, which is also the case in any non-free tier. We just include a 15-second option for that tier (because people it need for things like FB ads)

	▲	BugsJustFindMe 7 days ago \| parent \| next [-]
		In the post you talk about 5–10 minute explainers. What does one do if they want to make a 5-10 minute explainer if the maximum length is 2 minutes?
	▲	poly2it 7 days ago \| parent \| prev [-]
		Maybe clarify it a bit. Eg. "Short 15 second option".

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bangaladore 7 days ago | parent | prev [-]

Given that the next tier up is "Create longer/more detailed video (up to 4 min long)", I'd guess you are right.

Seems like this is pretty useless unless you pay 200$ per month. Which may be a reasonable number for the clearly commercial / enterprise use case, but I'm just not certain what you can do wtih the lower tiers.