Well, my reading of this is Ofcom did not lose overall and 4chan technically lost the lawsuit despite Ofcom having no way to enforce fines. I don't think Ofcom's purpose was ever to collect the fines either. Now keep in mind, 4chan is the first website that had ever been issued a fine by Ofcom under the UK's Online Safety Act. I think that is interesting because it's a noteworthy site which suggests the selection of it was more targeted. Note that is my speculation.

4chan sued Ofcom over the fines. Ofcom has been perhaps waiting for the outcome of this suit and is announcing they can't collect fines but I don't think that was the purpose. They have the power to instruct ISPs to block domains and to me it seems more likely that is what they will do and that was perhaps what they wanted from the beginning.

This is how the UK gets it's own great firewall.

Demand online services change their services to conform to their law. Because its accessible from the UK.

Services refuse.

Up goes the wall.