arvi89 Thx for your comment.
Brief answer > you are right!
My answer is not 100% sure but here are several arguments that support it:
1. I checked the Horizon API Reference doc for a substantial amount of time and found nothing about a built-in dividend payment mechanism
2. if you read the same page https://www.stellar.org/blog/using-stellar-for-ico/ a bit further, in part 3) titled "create custom ICOs"
the author reformulates:
"For instance, issuing dividends, bonds, escrow, collateralized debt, inflation, and the Lightning network are all possible on the Stellar network."
"are all possible" expresses more clearly the fact that it can be built in theory, but that it isn't built-in and ready-to-use now…
3. rumors exist that some assets circulating on the Stellar Network already feature a dividend payment mechanism but I found no proof of this claim after looking up numerous custom assets using Stellar.expert (an example: the project "eSACCO Plus" that won the 5th build challenge introduces a token named ESDT for eSACCO Dividend Token but its creators admit that first dividends will be paid only
"on 27 July 2019 and then annually thereafter",
source: https://stellar.expert/explorer/public/asset/ESDT-GDPQRGW5VNJU63L6R573S65DW4XSJZEXPH4IG5EMJBQD3QUCXSLVFW7A )
4. The word "dividend" doesn't appear once in this post by @jed
https://galactictalk.org/d/14-projects-built-on-stellar
In conclusion:
automated or semi-automated dividend XLM payment has probably never been performed via Stellar at this point. The community simply lacks a convenient tool to do it!
I hope I will manage to fill this gap ?