And you need a full bitcoin node, a wallet with bitcoin to make transactions in the bitcoin blokchain for minning...
The coin need the bitcoin ecosystem for work.
Too much dependencies, too much elaborate, and too much requisites for a new coin.
I see two posibilities, one monero holder wants to be richer or one random developer want your Monero/Bitcoin wallets.
And if this coin take same success. How you prevent an attack?, only need make a lot of Bitcoin transactions... and if in the future Bitcoin eliminate any fees... this coin will be dead.
But Bitcoin will not eliminate any fees.
By 2024, the annual inflation of Bitcoin will be below 1% per annum. This means Bitcoin miners will expect a significant part of their revenue stream to come from transaction fees. Poporo enables this to an extent.
Anyway the whole premise is that bitcoin keeps staying on the top.