What's with the weird network activity? Someone is consolidating thousands of "packets" of identical multisig UTXOs all to a single address. Around one million UTXOs consolidated in the last four hours. $10M+ spent in fees. Who is this and what are they d

The UTXOs are being consolidated in packets of exactly 138 inputs, with every input exactly the same size. In other words, this isn't an exchange consolidating user deposits. What's going on? Why would so much bitcoin even exist in these packets of identical UTXOs? Why the need to consolidate them all at once, and at a huge expense? Note: This isn't ordinals/runes. Any ideas? Thanks :)

Here's the address: https://mempool.space/address/bc1quhruqrghgcca950rvhtrg7cpd7u8k6svpzgzmrjy8xyukacl5lkq0r8l2d

Edit: Just to reiterate, I don't think this is ordinals related. There are random worthless inscriptions mixed in with the funds, but that's normal now with so many inscriptions being worthless after creation (e.g. BRC tokens). These funds are being consolidated, nothing new is being minted/distributed. The address held nearly $1B in bitcoin last month, so I expect this is linked to a CEX. Also note that while the identical UTXOs are small, they are not tiny dust-limit inscription UTXOs. Each are around 600k sats ($400).

Edit 2: They went from paying $5K in fees per TX this morning to now paying $15K per TX... Why the urgency?

Edit 3: Best explanation for the near-identical packets provided by u/pop-1988 ( https://www.reddit.com/r/BitcoinBeginners/comments/1dabm6c/comment/l7jgz1i/ ) suggesting that the source has such a large number of UTXOs that they have been sorted by size, and are being consolidated in TXs made of UTXOs of the same size. So it could actually be a CEX/gambling platform consolidating user deposits. What still doesn't make sense is them not taking more time to do this in order to keep costs much lower...?

Edit 4: The best combination of explanations so far:

1. It's a CEX (likely OKX) who have so many user deposits that, when sorted by size, they end up looking identical.
2. Security is so tight/complex for signing the multisig wallet, they wanted to get it all done in one day, regardless of the huge cost in TX fees.