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A VPN adds nothing on public WiFi. It encrypts communications in and out of the device. So does browsing HTTPS websites. Messaging apps use TLS end to end. If someone hacks the public WiFi and gains access to your device, a VPN won't help. It hides your location, and hides your DNS queries.
If someone gains access to your device, you have bigger problems.

A VPN on public wifi provides an additional layer of privacy and security against MitM attacks from bad actors on the same network or even the network provider and their ISP themselves who may (perfectly legally) exploit your browsing history or location data for profit.
 
Unless you are using HTTP (i.e. non-encrypted sites) or FTP (i.e. non-encrypted file transfers), what is the VPN adding in terms of security?
The VPN might be the one spying on you, and it gets all your traffic. Some companies say they don't keep logs, but it's been discovered that some do anyway (they lie), and earlier this year some unencrypted logs leaked. This is even true for some paid VPNs. So, not saying not to use VPN, but do some research, if that does any good, since some companies show no red flags until something catastrophic happens. Apple's relay approach might be better since no single party knows all your traffic info, but it's not a VPN and works only for the browser. Good luck.
 
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If someone gains access to your device, you have bigger problems.

A VPN on public wifi provides an additional layer of privacy and security against MitM attacks from bad actors on the same network or even the network provider and their ISP themselves who may (perfectly legally) exploit your browsing history or location data for profit.
And the VPN providers can do the same.
 
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