Only Nebula and Sirius can speak to the security of the site's IP logs, or the efficacy of it's image handlers meta-data scrubbing.
Nothing against GWE but I wouldn't trust it 100%.
You could protect yourself with an anonymizing VPN service (I use StrongVPN). With such a service your IP address is obscured and even if someone can find it, it will be false and there won't be any logs on the VPN server to act as evidence to track you. Anyone looking into my internet connection from home sees me as being in Arizona. The problem with VPN is it's just not that easy or convenient. You can get an account, download the client software, but then you have to open that software before you do anything on the web, and do this on every device you use every time you do anything on the internet. Or you could set-up VPN on your home router as I do, but it's a bear to configure, you lose a lot of bandwidth, and then if you connect from another location you're unprotected again.
If you use a phone to access the site there's nothing you can do to ensure anonymity -- the phone companies know all.
All this said, I wouldn't worry about it. We have a bunch of herd security ... there's so many of us across the interwebs that it would be impossible for them to come get us all

Ultimately if I were still in an illegal state I'd be more worried about my neighbors than being targeted on the web.
P.S. Your IP address is unlikely to be recorded in an image's metadata but there may be a log on the servers that host this forum that "could" theoretically link a posted image to your IP. However, that would require some cyber forensics and probably a warrant and hopefully those logs are scrubbed regularly if not immediately.