Before looking at fund flows, get the basics straight. Today, let's talk about the Cancun upgrade and blobs.
Blob data is stored only by consensus-layer nodes for about 4096 epochs, or around 18 days, and is deleted after it expires.
When comparing fees on layer 2 networks, remember to distinguish the layer 2's own execution fees from the cost of submitting data to mainnet; both can vary.
Layer 2 networks also pay $ETH to submit blob data to mainnet. The current amount is 1769.01.