List of well-known web sites that port scan their visitors

[LASER_oneXM]

Content source

https://www.bleepingcomputer.com/news/security/list-of-well-known-web-sites-that-port-scan-their-visitors/

Many well-known and heavily used web sites are using a fraud protection script that port scans your local computer for remote access programs.
Last weekend, news heavily circulated that eBay.com was port scanning visitors' computers when they browsed their site.

This port scanning was conducted by the LexisNexis' ThreatMetrix fraud protection script used to detect potentially hacked computers making fraudulent purchases.
When executed, a feature of this product uses WebSockets to scan 14 different TCP ports on a visitor's computer.
... ...

 

[ForgottenSeer 85179]

and possibly even Microsoft

So yes or no?
I hate that speculation and misinformation from media sites.

 

[Dave Russo]

What are the concerns (danger) and what if any thing should I do about this?

 

[ForgottenSeer 85179]

Also because the linked Google docs is a crippled document without any advantage for us user, i just add the following domain to my PiHole:
online-metrix.net

Let's see if this break websites. (keyword CNAME)

 

[Arequire]

So yes or no?

Bleeping Computer weren't able to confirm themselves:

We could not get the port scan feature to trigger on these sites, but it may have been used on a page we did not visit.

But Microsoft's name shows up on the list:

What are the concerns (danger) and what if any thing should I do about this?

It's ethically questionable but nothing to be concerned about. The scans are being conducted by well-known companies for fraud detection, not by malicious actors.