SyncError: 429 Server is unavailable when trying to connect

[Moult]

I suddenly started getting this error after doing /matrix connect matrix_org:

                │18:31 matrix_org  -- │ matrix: Connecting to matrix.org:443 (SSL)...
                │18:31 matrix_org  -- │ matrix: Doing SSL handshake...
                │18:31 matrix_org  -- │ matrix: Connected using TLSv1.3, and 256 bit TLS_AES_256_GCM_SHA384 cipher
                │                     │ suite.
                │18:31 matrix_org  -- │ matrix: received certificate
                │18:31 matrix_org     │  - certificate info:
                │18:31 matrix_org     │     - subject: commonName=matrix.org, serial number
                │18:31 matrix_org     │         C90E1BAA8E0F817411E7AC8400D9704A
                │18:31 matrix_org     │     - issuer: countryName=US, organizationName=Google Trust Services,
                │18:31 matrix_org     │         commonName=WE1
                │18:31 matrix_org     │     - key info: DSA key 256 bits, signed using ecdsa-with-SHA256
                │18:31 matrix_org     │     - period of validity:
                │18:31 matrix_org     │         Begins on:  Apr 24 20:01:05 2025 GMT
                │18:31 matrix_org     │         Expires on: Jul 23 21:00:39 2025 GMT
                │18:31 matrix_org     │     - fingerprints:
                │18:31 matrix_org     │         SHA1:   54:58:AC:12:2E:B0:22:9E:31:BC:7F:5C:00:25:0C:1F:77:85:11:27
                │18:31 matrix_org     │         SHA256: 36:4C:5B:A6:ED:7D:D2:FE:83:26:CD:87:7E:3D:DF:84:DE:CA:62:5D:68:
                │                     │ DA:54:63:BF:79:44:EC:3C:DB:D4:5F
                │18:31 matrix_org  -- │ matrix: Logging in...
                │18:31 matrix_org  -- │ matrix: Logged in as @moult:matrix.org
                │18:31 matrix_org =!= │ matrix: Error: SyncError: 429 Server is unavailable
                │18:31 matrix_org  -- │ matrix: disconnected from server
                │18:31 matrix_org  -- │ matrix: reconnecting to server in 10 seconds

Any ideas? Using venv Python 3.12 on Gentoo Linux