Are the forms secure and protect customers data?

Yes, forms are secure by default. The form URLs provided to the users are on HTTPS. This means all communications between your browser and the form are encrypted.

If you want an ultimate encryption, you can enable form encryption feature on your forms. Guide: https://www.jotform.com/help/344-Encrypted-Forms-and-How-to-Use-Them#How-Can-I-Enable-Form-Encryption

Furthermore, JotForm servers are protected by private networks and constantly updated and patched. In other words, your data are stored in JotForm servers securely.