OK. I'll watch out. Thanks for the heads up. :D
Had see a company going through rapid growth I see some good tips there.
Any of them will work as long as you can durably store your data. Relational databases have always implemented ACID and SQL which makes them easy to work with, and they can support almost any data model with decades of updates and tooling which is why they are the default choice unless you specifically have other needs. Newer relational databases can also scale horizontally by applying the same sharding techniques as the other database types, so even that issue is no longer relevant.
This Kraken which was barely usable during the hype?
Was the "Your transaction might have not succeed, please reload" message designed by you?
So ya they had a ton of tech debt to deal with to handle hyper growth.