I also think there has many vpn in play store. Among of them some Free VPN is unsecured and risky. But most of them are secured even Paid VPN are very secured and we can use that without any doubt.
No you should never use them without any doubt, but you can do anything you want with your money.
Just because you are paying for something that is not making that good, and most VPN services are just used for spying and collecting information from customers.
Mullvad and NYM are only two VPN services I would recommend, if they are paid with crypto payments.