You downplay the risk, but don't really address it head on. There is data out there about you and your family. Recall the tendency of human beings to arbitrarily discriminate or even perpetrate genocide. Hopefully, there will never be a legal framework requiring Google nor Meta (nor any of the literally thousands of data tracking companies) to hand over this data to powerful organizations who intend harm to you or your descendents, but if it came to that, hopefully Google, Meta and every one of the thousands of data tracking companies do the right thing and withhold data that could identify you as a suspect political minority and predict your movements.
Maybe there's something more mundane and relatively benign. Employment or benefits withheld because of your tendency to procrastinate and watch 80s action films. Your grand niece is canceled because you held views considered problematic by her generation.
Your only argument against this seems to be that it's unlikely. Perhaps, but that's argument from personal incredulity, not an argument that it won't happen. I would love for you to walk me through a rock solid argument that it cannot possibly happen.
Or, you know, we could establish a legal framework and social convention now whereby you can demand data about you and your dependents be collected only with your informed consent and deleted at will, just to not have to ever need to cross that bridge.