I finally came around to finish the Blockchaincom wallet write-up.

The Blockchaincom wallets follow the feerate recommendations of the Blockchaincom API closely (or over/underpay by a fixed percentage due to bugs in the wallets). This allows to identify a majority of the Blockchaincom transactions by combining the fingerprint and the feerate recommendation. I still believe the reported network share of one-third of all transactions is reasonably accurate.

The full article is here:

Following the Blockchain.com feerate recommendations - Wallet fingerprinting nearly a third of all Bitcoin transactions - https://b10c.me/mempool-observations/3-blockchaincom-recommendations/

Feedback, ideas, and potential future topics to add to my already long list are welcome. However, I'll be busy with other things in the coming weeks.