Your site talks of BunkerWeb PRO, which is, by the sound of it, not open source. But I have no idea what is actually different about it: https://panel.bunkerweb.io/knowledgebase/105/What-is-BunkerW... flatly doesn’t answer the question: “additional features and services responding to professional needs” is impressively vague.
Features with a crown icon are PRO, you will find full list of free and PRO features here : https://docs.bunkerweb.io/latest/features/
Might I suggest at the very least linking to that from https://panel.bunkerweb.io/knowledgebase/105/What-is-BunkerW... and https://panel.bunkerweb.io/store/bunkerweb-pro.