Is there a website where I can view the wealth distribution of BTC and different altcoins?
I know such data are only estimates (address != holder, exchange wallets, etc.), but would still like to get a feeling of how different coins are distributed among its holders.
Bitcoin/Cryptocurrency addresses are not like typical bank accounts numbers . An individual could have multiple addresses with no easy way of linking them to him/her. Banks accounts in most countries are link to unique identities.
I think there are services that show what exchange/platform owns what, but I doubt they are effective in general. Besides lots of cryptocurrency are held on exchanges. It would be difficult to get the information unless you get them from most exchanges.