These trademarks covered: “promoting the goods and services of others via computer and communication networks using targeted and non-targeted methods; operating on-line marketplaces for sellers of goods and/or services … providing advertising space via the global computer network … creating on-line virtual communities … hosting electronic facilities for others for organizing and conducting meetings, events and interactive discussions via communication networks”
So pretty likely to conflict with Facebook.
However, they transferred all of these to the Chan Zuckerberg Initiative in May: https://assignments.uspto.gov/assignments/assignment-tm-7299..., and as you mentioned, are now shutting down.
It’s not a great look. I would feel pretty bad if I had devoted years of my life to building meta.org to now see how it was used
Imagine acquiring a company via your non-profit purely to grab the name and domain names for your for-profit.
Announcement: https://cziscience.medium.com/meta-transition-5f66b1fae475