Websites Detecting Proxied Traffic?

I’ve been using tailscale for years and loving it and now most recently started playing around with exit nodes to prepare for an upcoming trip abroad.

When testing my exit nodes (one running on a mac mini and one on a raspberry pi), it seems like some websites (specifically amazon.com and algolia.com) either don’t like to serve my requests at all or significantly throttle my traffic coming through the exit node.

Since the traffic is still coming from my home network I wasn’t expecting to get treated as though I was connected over a commerical VPN. Does anyone have any ideas of what these sites might be looking for that leads them to throttle exit node traffic (clearly can’t be my IP address) and how I could debug this?

Ok, this gets even stranger.

I can access certain websites, like news.ycombinator.com, when I’m using the exit node. But most pages (including tailscale.com !) won’t let me connect, with an error message saying:

domain unexpectedly closed the connection”

Any ideas?