It's not a bad technology. It won't solve all the storage problems but it might be very handy for certain community areas.
The technology is well proved and understood.
The clever thing is it can be retrofitted to make use of existing sites and structures. Maybe even in buildings ?
https://reneweconomy.com.au/australian-start-up-eyes-disused-mine-shafts-for-giga-scale-gravity-energy-storage/
https://reneweconomy.com.au/energy-vault-starts-work-on-100mwh-gravity-based-storage-system-in-china/
