...there are many reasons people may want their own blood, ...
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I had surgery in 1981. Almost a year later, an apologetic and stressed RN called me (nothing in writing, BTW) to inform me I needed to test for HIV because the blood I received was contaminated.
I tested negative, but the angst, the anxiety, the sense of betrayal was huge. And it took so long to do the tracking that, had I been positive, I could have infected my husband.
You can only imagine my response to the Covid contact tracing program.
I am glad you are ok! I do not trust our blood system. But, I do give blood often...it is a healthy thing to do.