Somehow using VPN makes me feel safe while working with cryptocurrencies, like transactions, payments and buying bitcoins. I've been using surfshark vpn for almost 3 months now and I guess it's okay. I haven't really tried other VPN's though for I don't want to risk my wallet just to try other VPN. You know, like what's the point if I have my door lock for months and it's not even rusted. The largest risk with cryptocurrency is that online exchanges are vulnerable, as mentioned, to hacking they say. I know some may already experienced this kind of problem, and I wonder how you manage to solve this. As someone who hasn't encountered such, I think it's a good opportunity to ask someone who does and help me point out what other things to do to secure not just my wallet account but also my other personal accounts. 
I don't think using VPN would help making transaction any safer than not using it. In fact, it could be more vulnerable if not using it correctly.
What is "safe" to you though:
-Hiding transactions from the feds?
-Secure payment from hackers?
-Malicious third-party?
-Your spouse?
Whatever "safe" is means to you has a great impact on how VPN can help or not. VPN just makes it harder for someone to track you but it does not make it impossible. From recent discussion in other threads on this site, it seems that using cheap VPN can make it even easier for the Feds or hackers to track you since providing VPN for you isn't very profiting but selling your information is gold.
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The largest risk with cryptocurrency is that online exchanges are vulnerable, as mentioned, to hacking they say.
If this is what you worry about then look more into having a secure computer, secure browser, secure password, etc. instead of a VPN software. Cryptocurrencies are already secured as they are cryptographically encrypted by default.
-Pho