eBay caught literally port scanning its users’ computers.
https://nullsweep.com/why-is-this-website-port-scanning-me/
#SurveillanceCapitalism via cron.weekly
@aral That practice is around since some years.
https://www.theregister.co.uk/2018/08/07/halifax_bank_ports_scans/
As the scan is limited to some well known ports with malicious intent, I would think it's really more a protection than a surveillance method. But it's creepy that it's possible.