If you have a DRM-free stream on a mobile device, you can cast from it.

If you have a DRM-free stream on PC, you can use Sunshine (PC) and Moonlight (webOS App, manual install) to stream PC to webOS. You can use webOS Dev Manager to install on TV from PC. docs

Brand recognition. Existing web links and references to it.

While the site swiftly moved to new domains, the old ones were pointing to a seizure banner.

Streameast ‘Reclaims’ Streameast.xyz

Their name is still the same as before. So it makes sense to reclaim it.

They previously announced they were closing down, website already closed, and were working on a data export for users so they can download/transfer/migrate their collections (metadata).