Wikipedia still keeps tabs on who is updating what via IP tracking. It's anonymous (arguably pseudonymous if the IP is considered a name) but they still pay attention to users doing things.
> We have auto banned contents of hundreds of thousands files.
> Banned file names and also banned specific usage patterns ...
I don't think IPs are banned outright, but they lose the right to edit without an account. I think my mobile provider uses CGNAT and I can't edit anonymously on cellular.
> I don't think IPs are banned outright, but they lose the right to edit without an account.
By default, blocking an IP or IP range prevents users from those IPs from making edits, with or without an account, or creating accounts. Similarly, if an account is blocked, any IPs they've edited from recently get blocked as well.
All of these functions can be customized on a per-block basis; blocks on shared IP ranges are usually configured to allow account creation and logged-in edits.
> We have auto banned contents of hundreds of thousands files.
> Banned file names and also banned specific usage patterns ...
Nothing about banned IPs.