What it means it OCR is available with as cloud service for cloud orchestrators and for on-prem it is available in linux servers
There are paid and free ocr engines available. Whenever you drag a ocr engine if it asks for API key then it is paid and you need a license. Else you can use it for free one such example is tessaract ocr
Cloud orchestrator is different from On Prem orchestrator
On- Prem orchestartor means the orchestrator which you installed on your own server. Cloud orchestrator is hosted on another server and you access it but you do not host it( like the community Orchestrator is a cloud orchestrator)
Currently my company is using the On Prem Orchestrator and wanted to change to Cloud Orchestrator. And also wanted to change the server. Thus wanted to check whether the OCR activity will causes any error.