Great question — answering as the UphillTech team:
The Football Video Support (VS) system is new review system primarily devised to help Football Associations / Competitions with fewer financial / human / technological resources, whereby they are unable to implement VAR, implement a decision review system. Football Video Support (VS) is the answer to several requests that FIFA has received from those member associations that cannot implement the video-assistant-referee (VAR) system because their human and financial resources are limited and very few cameras are in use in their competitions. What is Football Video Support? For the FIFA youth tournaments - these are unlikely to be played in large stadia with VAR infrastructure in place, hence...
Full answer by ImClarky: https://sports.stackexchange.com/a/30195 (CC BY-SA 4.0).
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