Ethereum Already Showing Signs of Increased Centralization

You mean decreasing?

From the article "In the hours following Ethereum long-awaited Merge on Thursday, over 40% of the network’s blocks were added by just two entities: Coinbase and Lido."

When it was PoW just 2 pools controlled over 45%. [1] (“Ethermine remained the largest ETH mining pool with 25.0% share, up 21.5% from September - followed by unknown miners (21.8%) and F2Pool (20.5%). The top 5 known pools now account for 65.4% of ETH blocks.”)

[1]: https://blockchain.news/analysis/ethereum-top-5-mining-pools...

What happens if majority of validators ignore some of the transactions (for example from Tornado Cash)? If someone else proposes the block and they don't vote, does the block still get confirmed? Are they in danger of getting their funds slashed?