Running VPN servers costs real money. If you are not paying with a subscription, you are usually paying another way. Here is how to judge a free VPN, honestly.
The account is free; using the VPN requires a DESEO Plus subscription. There is no free trial.
Some are, many are not. Check ownership, the privacy policy, the store privacy label and the protocol before trusting one with your traffic.
Any VPN provider can technically observe traffic metadata passing through its servers. What matters is whether it logs, keeps or sells it — which is why the business model matters.