You asked about Robotics
Nobody in the register described anything this way.
| Launched | What it was | Today |
|---|---|---|
| 2014-06-01 | Quantum coherent supercomputing. · rigetti.com | acquired |
| 2020-01-01 | YCTeleo Supervised Autonomous Heavy Equipment · teleo.ai | acquired |
| 2018-06-01 | We build artificial intelligence processors inspired by the brain. · rain-neuromorphics.com | acquired |
| 2007-01-01 | YCOctopart Octopart is a search engine for electronic components · octopart.com | acquired |
| 2018-01-01 | Autonomous driving technology for farm tractors. · bearflagrobotics.com | acquired |
| 2019-01-01 | We produce cancer-curing materials used in nuclear medicine. · atomicalchemy.us | acquired |
| 2021-01-01 | Building robots to automate commercial concrete construction. · rointech.com | acquired |
| 2015-06-01 | Autonomous shuttles for campus-like environments. · auro.ai | acquired |
How this compares
The register re-probes every domain it holds. Some that answered last month stop answering. We send that list — what went quiet, and what it was — once a month. Nothing else.
How this was made. Show HN entries are every post from 2021 to 2023 with at least five points that linked to its own domain; code hosts and free hosting are excluded, because a repository outlives the effort behind it. Product Hunt entries needed 100 votes — a far higher bar, so they are the promoted top slice rather than a like-for-like sample. Both are judged by asking the domain whether it still answers: gone means it no longer resolves, refuses the connection, serves a parking page, or says plainly that it shut down. An HTTP error is not counted as gone — a server answering 404 is one somebody still pays for, and an audit of 25 gone-calls found two such sites alive with only a moved homepage. Y Combinator entries use the status YC publishes itself, which is why only those can say acquired. Squatted domains — a lapsed name now serving somebody else's site — are not detected, so these figures run slightly low.