There were only a few Immortals in the Qianyuan world, and every cultivator who became a true immortal would definitely bring a huge burden to the Qianyuan world, which was irreversible.
To cultivators, becoming an immortal was a good thing. It meant breaking the limit of longevity and having the qualification to climb to a higher level.
However, for the Qian Yuan world, it was not always better to have more Immortals. Cultivators plundered the world to become themselves, and Immortals were the best among them.
Once there were too many Immortals, the Qianyuan world would not be able to bear it and would definitely cause a disaster. This was no secret to the true venerates of immortal sects.
Whether it was Fu Yunzi or true venerate Yudu, if they wanted to become Immortals, they would have to bear the karma of the Qianyuan realm, pay a lot of driving fees, and get the protection of the immortal patriarchs.