Any way to identify or block these proxy and ad click services in the router? Say a Ubiquiti or even pfsense?

I’m not using any of these boxes for especially this reason, but about 10-15 years ago had noticed my treadmill pinging a Chinese portal. I removed the WiFi access from the treadmill but am curious if there might be other devices.

Any specific ports, etc these guys use or are they mostly impossible to distinguish from regular internet traffic?

My another worry has been if these can monitor other Internet traffic, though I think HTTPS should mostly prevent that.