after downloadmoreram.com was such a success, i guess something like wifi-hotspot as a service should exist somewhere too

hm, without adding "new" hardware you say?

• add an old wifi stick
• add an old raspberry pi 1
• stick the stick into the berry
• add hostapd package to berry
• add old ethernet calble and connect berry with the switch in the picture
• configure hostapd to mimic a wifi hotspot (thus its not "added", just mimic'ed)
• configure routing, nat, dns and dhcp server (wlan side) on berry
• configure dhcp client on berry for lan side
• use an old cable tie to tie things together so it becomes "one piece"
• connect the switch with another old ethernet cable to your neighbours internet router

tadaaa !!! turned into wifi hotspot without added hardware beeing "new"