nothing can be 100% secure, ever technically. Even servers you physically have on your own premises can be insecure
However it’s certainly possible to get secure enough that it can’t be accessed with current technology /knowledge
The cloud is is a server (or bunch of servers) that is hosted in a data centre. The data centre takes care of the physical security and hardware maintenance side of things
You can own your own servers on there or rent hardware through AWS / Azure / Oracle which you can for only what you need
Now the actual system you maintain so it’s as secure or insecure as you make it. They may have services you can consult with to assist you in securing it
If you are referring to the cloud as something like icloud, that is pretty secure and has not been hacked (as far as I know) but far more likely people have been phished and their username & password has been stolen. This doesn’t mean the cloud service is insecure
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