You asked about Reinforcement Learning

17 people built something like it. 3 are gone.

That is 18% of the ones whose fate we could settle, against 23% across the whole register.

Matching
27
Gone
18%
Median life
Acquired
0

Matching launches

checked 12 hours ago · 250 probed today
LaunchedWhat it wasToday
2021-01-30
nn.labml.ai
still up
2021-03-17
gpu.land
moved
2021-04-10
removebackground.app
still up
2021-07-19
primerlabs.io
unverified
2021-09-24
magicsheets.io
moved
2021-06-28
sample.findka.com
unverified
2021-09-04
vim.is
still up
2021-05-08
tiny.school
unverified
2021-01-06
buschermoehle.org
still up
2021-01-07
deckmill.com
still up
2021-11-15
cppbyexample.com
still up
2021-03-13
reallyconfused.co
still up
2021-01-31
hacker-ai.com
gone~60mo
2021-09-23
remnote.com
still up
2021-09-07
arthurdouillard.com
still up
2021-04-14
storagetarget.com
still up
2021-07-23
backgroundremover.app
moved
2021-03-02
blog.repl.it
gone~8mo
2021-08-03
datarevenue.com
unverified
2021-06-18
hotpotenglish.com
unverified
2021-10-05
odysseyapp.co.nz
gone
2021-01-13
remnote.io
moved
2021-05-29
learn.circuitverse.org
still up
2021-02-28
learnobit-36a54.firebaseapp.com
still up
2021-03-24
palletml.com
still up
2021-11-04
lazywords.com
still up
2021-04-02
backprop.co
unverified

How this compares

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.