As the other post was closed, I wanted to repost Andy's comments.
"GHL already use n8n (white label) for their Workflows"
I've confirmed this via inspect on Chrome. It IS n8n.
"If they wanted too, they could use n8n for a lot more, including their app integrations, but maybe they get some affiliate from Zapier which is why they use them. That's not an issue, we're probably all affiliates here, but it would be nice to have the option. For now I'm using the API and Webhooks with n8n.
By the way, n8n does already have integration into GHL :)"
Andy was right, GHL do use n8n, which is not a problem, it's great, but it does mean there is the potential to open up workflows to use n8n's 350+ integrations/ apps.