Before tracking the money, first get the rules straight. Today, we're talking about the Cancun upgrade and blobs.
Blob data cannot be accessed by the EVM; contracts only see a versioned hash calculated from the blob's KZG commitment.
When demand for blobs suddenly increases, blob fees rise too, so Layer 2 transaction fees aren't always that cheap.
Layer 2 networks submit blob data to the mainnet and pay blob fees in $ETH as well. Currently, it's 2367.43.