HBO Max (now Max) has some of the best original content on any streaming platform — but the full library is only available in the US. From Game of Thrones to The Last of Us, a VPN ensures you never miss HBO's latest releases. The reason for this is structural: streaming services license content country by country, and HBO Max's catalogue in each market reflects whichever distribution deals were signed there. A title that's available on HBO Max in the US might be on a competitor's platform in the UK, or vice versa.
A VPN sidesteps the geography problem entirely. HBO Max sees the IP of GhostShield's exit server, not your real one, and serves you the catalogue for that exit region. The streaming app makes no distinction between a 'real' local user and a VPN-connected one as long as the traffic looks like residential broadband — which is exactly what WireGuard with ChaCha20-Poly1305 over GhostShield's network produces.
What you can't do is bend the laws of physics: a stream from HBO Max's US servers will always have more latency from far away. Pick the GhostShield server closest to HBO Max's data centres in the region you want, not the one closest to you.