Not flagging unsafe content per se as such, but quite some users may like to avoid some of what the amazon.com.mx site is contacting (ping).
What users actually should block on -amazon.com.mx = -s.amazon-adsystem.com
This is not about unsafe content, but about third party coookie tracking,
where also inevitably markmonitor is being involved.
So it is al about consumer-end-user.tracking and your personal privacy as a consumer/end-user.
Know for instance that Privacy Badger extension blocks it inside your browser of choice.
How that particular third party coookie solution is being advertised towards ad-marketeers,
and that is why I present it here, but not as a live link:
hxtps://confection.io/third-party-cookies/amazon-adsystem-com/
polonus