I would even worry about them having my DNA when I’m dead - considering I have a daughter! Hopefully they don’t already have it...The good news is that I’ll continue to live for today and only let my “worries” serve me, as caution and as a way I can educate my loved ones.
I definitely agree with the reasons you’ve stated as to why those people are paying to have their DNA analyzed (at their own peril). It’s doubtful they realize what they’ve gotten themselves into but then again, they probably wouldn’t care if they knew.
Have a great day!