Before migrating to Lemmy, I decided to request a copy of the data Reddit has on me.
To my surprise, the export includes a file ip_logs.csv with a list of all IP addresses that I used to connect to Reddit for the last 3-4 months!!
That seems quite unnecessary.
I imagine they use it to keep track of alts and ban evasion, not surprising to me and you should probably assume that any site you visit will store your IP forever.
They also track your hardware, if possible. I had to replace a few laptops over the year.
For the love of god use Tor with tails, or at least just Tor on its own. Even that’s probably overkill, but with telemetry monsters like Reddit it doesn’t hurt to go above and beyond.
Generally the tracking Reddit does is this:
Cookies
Cross site tracking (just like Facebook does)
Canvas Data and User agent (including browser window size)
IP address (generally the last thing they target to prevent cross-bans on public WiFi and universities)
Replacing a laptop isn’t necessary to get around it, this is a lie spread by moderators (and also admins in some cases) trying to mystify the ban evasion detection system in an effort to curb ban evasion. Using a private browser that limits information is usually sufficient, using Tor is very effective, and using Tor with tails is insanely effective if maybe a tiny bit overkill.