Ridiculous. What are you even talking about? They do offer something for protection before the fact. Tons of companies do, but not one company can 100 percent protect you from Ransomware.
Also, there is no 100% foolproof way to prevent certain things. Some employee needs access to sensitive data to do their day-to-day function. Those people are supposed to access those files. You can at most prevent the ransomware from encrypting other employees files at most. This is why a proper backup is the proper solution at the moment against ransomware.
Most ransomware are there to extract money. Believe it or not most ransomware aren't interested in your private data. They don't even store your files. They store the private key. All they do is give you the private key so you can do it yourself - once you pay the ransom. All can be avoided a proper backup. How granular will depend on your backup budget.
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