The BunkerNet feature is completely optional. You can disable it at any time, however, you will not be able to take advantage of crowdsourcing on threats if you do so. More information here : https://docs.bunkerweb.io/latest/security-tuning/#bunkernet
Enterprises pay a shitload of cash for that functionality of commercial WAF systems. Some allow that at a low let cost of you send your own data, and more expensive if you don't.