I think it's inevitable. Whenever human invents a good thing, another human finds a way to circumvent that good thing into bad thing that profits them.
Okay a genuine question, what is the method to not let them do this to us? The legitimate only way I can think of is completely disconnecting from society, but this is near impossible because it's near impossible to find a place you can become self-sustainable, and it also takes a lot to even accrue the wealth to have the means to become self-sustainable, which means beimg a part of this society.
It’s sad this even has to be joked about, but knowing the rich they’ll share any immortality treatments, but only for the twisted reason to ensure there’s no escape.