If you visit USPTO website and enter "meta" you will see that there are countless trademark applications including "meta" filed after the Facebook->Meta rebrand. Some of them are filed by very big companies (e.g. Metamobility – Hyundai) who are probably using qualified lawyers.
Is there any evidence Meta Platforms Inc. trying to oppose all or even any of these? Just because they trademarked 'meta' as a single word does not create a situation where the extremely generic 'meta' becomes completely off-limits for anyone.
And while people register legal entities, launch services and products and apply for trademark registrations with 'meta' in their names yet there you are claiming Meta Platforms Inc. is going to take away domain names just because they have 'meta'. Why spread
FUD?