THE MILESTONE
Robinhood Chain reached public mainnet.
The post frames this as the real story: Robinhood launched its own Layer 2, rather than simply announcing a few new things.
Public-mainnet brief
The event was the launch.
The supplied post says the real story behind Robinhood's London event was not only announcements: @RobinhoodApp launched its own Layer 2, Robinhood Chain, on public mainnet.
L2
The post says Robinhood Chain is built on Arbitrum. It does not provide fees, bridge flows, metrics, tokenomics, or roadmap details.
A launch, read in three layers.
Separate the event context from the network milestone and the stated technical foundation. Everything beyond that stays outside the source boundary.
THE CONTEXT
The World is Flat, London.
The July 1 event is the setting for the launch signal described in the post.
THE FOUNDATION
Built on Arbitrum.
Arbitrum is the only underlying technical foundation named in the supplied fragment.
Inspect the launch
Choose a layer.
The London context.
On July 1, The World is Flat event in London provided the setting. The post says the deeper story was the chain launch.