Well, this 80% efficiency is what they are targeting not what the system will do. The test system Energy Vault build in a MUCH smaller form factor had a round-trip efficency of 75%

The EVx ™ system is projected to achieve an impressive round-trip efficiency exceeding 80%. Source

Only time will tell if they can reach 80% with a bigger system or at all. If they actually manage this it would be a decent alternative to Hydrodams in areas where these are just not possible since it would be a similar round-trip efficency.

Pumped storage systems have a round-trip efficiency of about 80%, which is competitive with battery storage. Source

In my opinion these systems are inferior to fly wheel energy storage (can reach up to 90% round trip efficency Source) but might still be an option depending on price.

That would be a fun website. Asshole tracker for Companies & Politicians and others?

I dont think either system will be the one prevailing in the long term, they are both to flawed and do not prevent corruption which will always destroy any system. So yea both are bad, which leads to the question which is currently worse? I’d argue latestage captialism corpo America is worse then CCP China at the moment. I think more average people are suffering in America then in China at this point in time. Dont get me wrong I’m not a fan off China in terms of censorship, oppression of people and other control measures in place, my only argument is that living a standard live in China is easier/more comfortable at the moment then in the US (better healthcare, less household debt, less homelessness, etc.). Also the Taiwan situation is very different then the Tibet and Uyghurs oppression but that’s a whole other topic so I don’t wanna start that discussion

They will have to keep it open for all permanently because OnlyOffice is published under a AGPL v.3 license. Any derivative work needs to have the same license meaning the code needs to stay public. They dont have a choice but I don’t think they would close it down every anyway