When the Qingfeng Sect was founded, its main opponents were Demon Beasts, not human Cultivators.
In that era, many Spirit Veins were unclaimed. It was far easier to seize them from other factions than to vie with Demon Beasts for them.
Higher-tier Sects like the Holy Lotus Sect knew a Tier Four Great Demon lurked deep within Black Mountain, so they would never invest resources into developing the area.
It might have been one thing for Core Formation True Men to venture in, but if a Nascent Soul True Monarch entered, how could the Tier Four Great Demon that considered the Black Mountain Range its territory not react?
The Holy Lotus Sect wasn't absolutely confident it could defeat the Tier Four Cyan Simurgh, so naturally, it wouldn't undertake such a thankless task.
Therefore, when Master Qingfeng chose to develop Black Mountain, he faced no resistance.
The other Sects were mostly content to watch the spectacle from the sidelines.
