Unlined suits are nut necessarily unsuitable for use at a public beach/pool. I have a few that are made unlined ("I Am Splash" and "Marcuse" brands) and don't go transparent when wet, as well as a couple that do go a bit transparent that I wouldn't wear where there are lots of people around. There is no point in upsetting people just for the sake of it.
Some suits I have also removed the lining of, but only after checking (usually by putting them on back-to-front in my backyard pool) that either their fabric colour and thickness, or their pattern, are such that they are still suitable to be used in public.
Similarly, not all lined swimsuits are appropriate for public pools or busy beaches, as very light colours can still be quite see-through when wet, even if lined.
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