Is that fate of becoming a hybrid lost soul earthbound spirit and collaborating with spirit meddlers the true meaning of selling one’s soul to the devil?

This is a very vivid illustration of what that can mean. As you know, there is no Devil, there is no Satan, but there is evil and the fallen angelic beings, the spirit meddlers, are the embodiment of what happens when Creator’s love is absent, and beings become desperate to survive and must prey on other beings around them to take their energy in order to continue living. This is a slippery slope and these beings have descended into much depravity, all in a desperate need for life force energy they can use for themselves. This they get by causing suffering in their victims and they have been so corrupted by becoming adept in generating negative emotions by causing pain to their host, it is almost like an addiction where they relish the exercise in all of its aspects—enjoying the power they hold, the cleverness and diabolical scheming they employ to subvert their host, and delight in undermining and thwarting their plans, derailing their lives, and causing their downfall. It is a depraved perspective when considering that the loss for others somehow elevates them through a display of their power to create such disruption. So when earthbound spirits are approached by the spirit meddlers with enticements and offers of assistance, but also the lure of having power and being able to have a way to hold power over and manipulate others and even take revenge on former enemies, it can seduce many earthbound human spirits to fall into the trap in becoming, in effect, a criminal in spirit form, and then will have many setbacks and losses, and times of suffering by making this choice, and that is the fate of all perpetrators—they never see it coming until it is too late.