Misleading · what the seller says
Without a VPN, everything you do online is wide open to hackers.
Without a separate service, your traffic is visible to anyone on the same network or anywhere along the way.
What is true
HTTPS protects the contents of ordinary browsing between your browser and the website. A VPN can hide traffic from the local network, but it cannot make a scam site or malware safe.
A VPN encrypts the connection between your device and the VPN server. The local network sees less, but some trust shifts to the VPN provider. It does not stop phishing, password reuse or malware on your device.
A VPN can be useful for employer-provided remote access or limiting what a local network can observe. Check operation and local rules separately on a restricted network. It should not be sold as a cure-all for ordinary home browsing.
Research into VPN advertising found systematic exaggeration of online threats. Compare the actual features, ownership, data practices and independent audits instead of relying on an advert.
What you can do: Pay attention to browser connection warnings and check the site address before signing in or paying.