Yes, Peat is Mined, most of it comes from Canada.
The use of Peat in Gardening is a rather hotly debated topic. There are renewable options such are Oak Leaves that offer similar benefits.
Here I'll "resurrecting" a Melted Crypt in 25% dirt /75% Oak Leaf litter.
I believe there are ancient Coral deposits that are harvested in Florida? Oster shells are a renewable option for Crusted Coral. There are alternatives if one simply looks.
I salute your Moral Compass
I got out of Salt/Reef keeping 20 years ago due to destruction of habitat by collectors.