Unless you’re doing trading on your home network, you cannot trust the operator of a Wifi hotspot. They don’t have to be actively malicious to cause harm. Encrypt all your activity at the client and leave nothing to chance.
When you browse, you connect to thousands of web servers every single day. Most of these connections are to advertising and tracking services that build profiles on you, and sell them to the highest bidder. Windscribe will greatly reduce these needless connections and mask your IP.
Your Internet Service Provider can see what websites you visit, and how often. This data is stored for long periods of time, and made available to law enforcement, advertisers, and data brokers. There is no reason for them to know what you do online.
Security is built into the blockchain already. Using a VPN will not make your trades more or less secure.
If you download shady software or open email attachments from people you don’t expect to send you attachments, a VPN will not help you to stay secure. Basic common sense will, and it’s free!
Changing your IP doesn't magically make you anonymous. While Windscribe does help to a certain degree by hiding your location, it’s just one part in the quest for total online anonymity.