How does this site track me into an incognito browser session?
Got a Reddit ad for an investing simulation game last week, it's called Compoundle (https://compoundle.com/). As the name suggests, it's a one-a-day game like Wordle.
I played it for a few days last week, then wanted to replay a couple of the days, so I opened a brand new incognito session (ie, no prior incognito tabs, not logged into anything, etc). I navigated to the website (just the domain, no tracking parameters in the URL) and was surprised to find that it knew who I was and had the same score as my normal browser session.
I've tried switching from wifi to mobile data and turning on a VPN after opening incognito but before navigating to the site, but it still knows who I am.
I have a bit of experience with this stuff, but I'm so confused about how this is working. What sorcery is this? I'm stumped!
Help me understand how this is tracking my regular session into incognito, even if I arrive from a unique IP? 🙏