The $295 Studio activation key is a one-time purchase (with free lifetime updates) that unlocks specific high-end features:
For multiple editors working on the same project simultaneously. How to Get Studio Legally (and Cheaper)
For most YouTubers, social media creators, and hobbyists, the free version is more than enough to produce cinema-quality work. When Do You Actually Need the Studio Version?
If you find a website or video promising a list of "working activation keys" for DaVinci Resolve Studio 18, they are almost certainly fake. Blackmagic Design uses a rigorous license management system.