regarding ->>> …50% of the value in the Tezos network, at genesis, was held by 156 accounts,

as most of the comments suggested it is pretty high wealth distribution inequality;

and, regarding ->>>>>>>>>> …Tezos has baking. Bakers obtain the right to create blocks when a Tezos token (or rather a roll, see below) they own (or that is delegated to them) is randomly selected to create a block.

outsiders of the project who want to run a node and do mining will have little chance of competing with the large holders of Tezos; this will limit the number of running nodes on the network and may doom the project;