Being able to handle 250K connections versus sustaining 250K connections are two different things. If you have a chat application used by mostly north american

Being able to handle 250K connections versus sustaining 250K connections are two different things. If you have a chat application used by mostly north american users, your usage is going to vary wildly between day and night. Cloud Run allows you to scale this up and down with ~zero ops work. Engineering for highly variable capacity and engineering for extreme scales are two entirely different problem spaces. If a managed platform like Cloud Run makes your business more efficient and you can save on compute costs, the "efficiency" that you're talking about is completely moot. Being able to handle bursty loads when you need to and being able to consistently handle large volumes of traffic are two separate and unrelated problem spaces.