What are the most interesting places that auctions are used onchain?

What flavour of auction do they use?
(English, Dutch, Vikrey, something else?)

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You are likely aware of most of these, but some of my favorite onchain auctions are:
- Solver auctions based on intents (like CoW Swap, @uniswap X, @matchaxyz,...) 
- Nounish auctions that fund amazing DAOs (like @nouns @publicnouns @gnars @vrbs )
- Useful IRL auctions (like @devcon tiks) 

I also think fair-launch auction mechanisms should be used for the start of most bonding curves.