Resource Burn. Meta can throw more money at any court case, so if the judge is bent, which happens, it can become a long drawn out process. Personally though, despite having the trademark for a trademark with the word "threads", note lowercase, its also got a logo filed which might complicate the situation. https://trademarks.ipo.gov.uk/ipo-tmcase/page/Results/1/UK00...

Plus they only have a few catagories selected from Class 9. https://trademarks.ipo.gov.uk/ipo-tmcase/page/History/1/UK00...

Personally I would have filed the logo and word seperately to avoid any confusion, otherwise situations like this court case could present themselves, but maybe that is/was the intention when it was filed.