Or maybe the other way around
I had already seen the video, it’s nice, there are some good ideas! 
Oh wow… it’s so inspiring to see such a totally crazy project!
It’s clear that at some point, home automation device manufacturers will need to lower their prices…
At Ali’s shop, there are still some cheap things:
https://m.fr.aliexpress.com/s/item/32828330727.html?spm=a2g0n.search-cache.0.0.54e8f64W81csY
Yeah but what about the range and reliability of this thing?
If my house catches fire, I’ll hold you responsible 
That’s the thing with Ali 
And yet… here I’ve linked a streamlined version ^^
At AliExpress, you can also find the Sonoff brand: https://fr.aliexpress.com/item/DIY-Sonoff-WIFI-Wireless-Smart-switch-Remote-control-for-Smart-Automation-Home-Light-Support-IOS-Andriod/32782187934.html
Sonoff offers a wide range of wireless products (Wi-Fi, 433MHz, remote control, switches, etc.) based on the ESP8266, whose firmware you can easily change to customize them.
On their website (https://www.itead.cc), they announce compatibility with Google Home and Alexa…
We discuss it on the forum: https://community.gladysassistant.com/t/itead-sonoff-compatible/1439