Another annoying aspect of using vpn is that whenever you use vpn you will get annoying ads which are really annoying. And choosing a good quality VPN is difficult. Most countries can use crypto exchanges directly without the hassle of a VPN.
The same is the situation here, I don't really need to use any kind of VPN connection in order to use crypto exchanges in my country because there isn't any restriction from regulators of my country on those exchanges and they have been working without any issues.
However, I must say that if there were restriction from the government on those exchanges then in that case I would also go with a VPN to use those exchanges. But, I would only go with a paid VPN service that wouldn't keep logs of the users because that would be the most preferable and safe option for me.
The free VPN's are often bloated with adware and that's why they are annoying for me, but the ads aren't much of a concern for security, however, if those VPN's aren't run by a secure and trusted vendors then there are changes that our accounts and other confidential data can be exposed if they keep logs of the connections.
I really don't prefer free VPN's for something that has to do with accounts and financial assets because trusting those could cause huge damage, and that's why it's better to avoid those. However, if someone is still in need of using those to browse the exchanges then that's his/her own choice.