I like “duly waited three months to see if there was any objection. There was none.” given that the tweet objection came before the 3 months was up and their statement came out the day after (so I believe).
I honestly don’t think they meant anything bad by it though, it would be a push to say they thought “Look at these hugely popular Makerspaces that are popping up, lets create some drawers to profit off them!” I guess they trademark all their new products and their mark for storage products is unlikely to affect us.
That said, as previously mentioned it would cost ~£270 per term (i.e. Hackspace & Makerspace) to register them so it’s probably worth it. I’ve registered a trademark but it was a little while ago, I recall you can offer different marks within the same registration, I think I did “Where Dial” and “WhereDial” and I don’t remember it costing extra. If possible (and especially if it’s free) I guess we might want to go for Hackspace, Makerspace, Hackerspace & Makespace but perhaps those last two are unnecessary.