There are accounts in the meta. The new login system is being rolled out by Meta. If you don't have the option to create a Meta account right away, you'll get the update soon. You need to register for a Meta account to use your device after January 1st, 2023 if your headset is tied to an account. The new system was announced last month in a reversal of the company's previous stance.
You can still use those services to create a Meta account, even if you don't have a Facebook account. If you have already linked your device to Facebook, you can use an email instead. To use the company's vision of the metaverse, you'll need to create a MetaHorizon profile with a unique usernames.