maybe they did, but then the troll would have fought the case and probably won

everything is a negotiation

Edit: 1 downvote today and now I can't respond

Even if the case turns out your way, the laywer costs to fight the case in court may be large enough that settling is better for your. It doesn't matter which side of this you are on.

It’s worth noting that in the UK the loser pays the costs (subject to various standard and maximum rates etc.)

That doesn't matter - when going to court you might lose even if your case seems perfect. The rates things are subject to help to limit how bad things can get, but you still need to have some protection just in case you lose and have to pay up.

Loser usually pays fees in UK litigation.

Base on what evidence do you think the potential conclusion the the troll is winning the case?