Use their funds to buy EOS in your own ICO → Have both the funds and the EOS

Every ICO including Ethereum could do this and why all projects like Ethereum and EOS are all laughed out of any serious discussion.

The idea behind EOS is that the processes of storing the blockchain, the ‘block propagation’ and the execution of smart contract code should be handled by only 21 parties, called Block Propagators (BPs).

No it’s not. The only thing 21 BP do is determine consensus. Other nodes can still do all the other things to validate them, just like on any other blockchain. 21 BP to decide consensus ends up being more than 3–4 block producing mining pool nodes on many other blockchains.