[1]: https://eth2book.info/altair/part2/incentives/inactivity
Inactivity leak is an emergency measure to restore liveness when the network stops finalizing blocks. It happens when >33% of validators are offline(WW3 scenario), major bug in widespread implementation, etc.
Your link explains that.
ETH2 is friendly to home stackers - you may lose some profit by being offline sometimes, and in the worst case minor penalties are applied.
EDIT: If you are interested in a much better description of what happens if you are offline, see this:
https://eth2book.info/altair/part2/incentives/penalties
Some points from the link:
- penalties =/= slashing
- If you are online > 42.5% of the sime - you are earning profits
In that case, without any stakes, half of nodes will be locked to NIL, half - to a valid block.
In case of stakes, byzantine proposer (it is only one node that is really byzantine, but it can control how network is split) can partition network according to a proportion of stakes, so that neither half gets prevalence.
The algorithm in the link you provided does nothing in that case. The only node that will be punished is a byzantine validator which does not care.
The system will be in no-progress-possible state indefinitely.
In PoS you still have the staking tokens.
To me it sounds like staking has a much more powerful snowball effect than mining and the gap between the wealthiest ETH participants and everyone else will increase faster under PoS.
Every holder who is staking is rewarded for staking, in proportion to their stake.
> To me it sounds like staking has a much more powerful snowball effect than mining
No, because issuance under proof of stake is much lower than that under proof of work.
The point of validating is to secure the chain, not to get rich. The more validators that are active, the lower the per-validator rewards, reducing compounding effects.
Also you lock-up capital which has an opportunity cost and must competes with every other investable asset. As the barriers to entry staking are negligible (just acquiring a liquid staking derivative like rETH, for example) it means that everyone willing to stake will likely do so which drops the returns lower, which may push some stakers out as they see better investing opportunities. So staking is likely going to have thin margins in the future and will give a rate of return that is fairly priced given its risk adjusted returns.
Last I saw, ETH mining was about 33% profitable. With mining rewards ten times higher than staking rewards, that means miners take home about three times more on their investment than stakers.
Stake pooling also eliminates one of the supposed benefits of decentralised cryptocurrency - you have to trust someone else with your currency.
If I have to give my currency to a third party who will then invest it for me, then why bother with decentralised cryptos at all?
>any operation on the network requires trust that the network will do what it agreed it will do.
If I were an Eth apologist, I would explain how the code that defines the network operations is fully open and inspectable, so no trust needed.
$4k vs $128k
Literally the same numbers.