Fortnite: Battle Royale, which is the edition of Fortnite items that most everybody is playing, does not have any real means to receive totally free V-Bucks. The only way to acquire V-bucks given to you in-game would be to purchase the conflict pass and rank this up. And if you did get slightly more V-bucks than you set in by doing so, it is not much.
The catch has always been that you have to pay upfront to get Conserve the planet, even though you can finally make the math work by farming V-bucks. That math gets a whole lot more favorable with this reduction, and you will essentially turn a V-buck profit just by collecting the sign-in bonus for 100 days. And you can get far more than that by registering in and completing assignments.
So is it worth it? It's always kind of pleasure to farm premium resources, at least if you're the sort that enjoys making slow, steady progress. And, needless to Buy fortnite materials say, Save the World is a game unto itself: it is a combined PvE zombie survival affair. I haven't spent a huge quantity of time with it, but the overall consensus is that it doesn't quite manage its sprawling market in addition to its compact counterpart, despite having a few fun concepts and styling. It has its devotees, just not nearly so many as Battle Royale does. It's a work in progress, and Epic is planning to create it free-to-play once it is completed, or at least done.
I'd advise against purchasing Save the World only for farming V-bucks: you may also spend that time and cash playing whatever you would like to perform with. But if you're curious and think you could actually give the thing a move, this is a good time to do so. It's not such a terrible spot to practice your shooting and construction, either, even hordes of zombies really are a little more forgiving, targeting-wise.