It’s actually still $25. You, the user footing the bill, isn’t getting 6 people’s worth of entertainment from it.

It’s also $300 a year, plus taxes and fees and whatever else. If you’re actually collecting on those 5 other users, every month, reliably and automatically (unless your time is literally worth nothing), then sure. But financially it’s usually ill-advised to assume that ‘if I can just get X others to do Y for Z time, then the price goes down’. Most fall into this, fail to capitalize on the opportunity, and end up spending equal or more compared to a single-user subscription.

Just be sure that the ‘winner’ in the situation is truly you, and you aren’t being had by the thought of $5.