None of the last 50 transactions were from 0xff2B5d4114190bB6447Dbae098096Fd274029535 and to 0xff2B5d4114190bB6447Dbae098096Fd274029535. So, how?

And what's the significance of this? I'm genuinely puzzled.

I had the same issue. I'm using Ganache UI default mnemonic. I suppose anyone with the same mnemonic can access the default addresses.

It all came from the MetaMask faucet https://ropsten.etherscan.io/address/0x81b7e08f65bdf5648606c... through numerous intermediary addresses (maybe the faucet limits the amount of ETH it will send to the same address, I'm not sure).

Possibly someone trying to attack the testnet. Or someone is bored and wants to see how much testnet ether they can accumulate.

Ok?

This is just a page with transactions. Where is the "news" part that makes this interesting to the wider audience?

I think the significance is the from accounts being different and the number of ether the account has.

There's some hack like using the same mnemonic or something that's allowing them to do this.