Mate, none of those are "Layer 0". That's just a marketing scheme to make those chains seem like special snowflakes. Next, people will start selling "Layer -1 Solutions". I'd also love to hear your reasoning for putting Avalanche/Cardano and Solana/Bitcoin in separate layers. Avalanche and Solana both use POS and are trying to accomplish the same things, and both ADA and BTC use UTXO ledger models.