Yes, Your data is completely safe with Predictly. Predictly runs it’s annotation process completely on cloud and has multiple security mechanisms which helps in protecting your data while annotations are going by annotators.
For readily available datasets you can directly download those after made the payment and for the customized datasets we are offering multiple ways to consume the datasets like storing at your cloud provider directly, Uploading the dataset to your server
Yes, Predictly do offer data annotation on your custom data.