It is up to is parents to ban small magnets from our homes when we have under threes loving there. This is what I did. I tell the older guys they can’t have magnets in the house for at least 2 years.
I hate to tell you, but these things do represent a frightening and insidious hazard. The magnets are extremely strong, and if two or more are ingested, they will inevitably clamp together across who knows what organic boundaries, and wreck havoc which can only be remedied by surgical intervention, if it’s detected in time. Spoken as a grandfather, maybe, but these are not your grandfather’s magnets.