Ebay seems to be blocking an awful lot of server based sniping services based on the IP of the snipe server. That's what this CAPTCHA garbage is all about.

Any chance you might add support so we could keep the PC on and bid from the local app?

Captcha issue is almost gone, and I see it's decreasing.
I don't think they target sniping services because those services bring more bids to them after all.
They mostly target bad activities like password guessing and things like that.