4chan has nowhere near the influence over children that TikTok does. Maybe a /pol/ thread gets 500 replies or something, while Cobra Tate (a sex trafficker who went viral by openly hating women) gets 100M+ views by literal children on TikTok who go on to repeat everything he says.
And yet, primary complain about tiktok is that it is shallow or cringy. I remember some complains over ableist algorithms. The complains about racism and what not are vanishingly rare.
Is that surprising given that there are approx 2 or 3 orders of magnitude difference between the popularity of these platforms? 4chan is and has always been fringe even within its demographic, whereas TikTok is already one of the dominant networks.