Everyone thinks they have big data and 99.99% of the time, their entire DB could be served from a single 100GB SQLite file on a single SSD on a random dev's laptop with better performance than the expensive AWS deployment they've rented. They think they have super-concurrent stuff and locks are important, but modern machines are so fast that data can be added faster than their users can input data.

People don't realize just how big 1MB is if it's not multimedia. If you had 100,000 users consistently writing 1kb to your DB every single day, it would still take a 10,000 days or over 27 YEARS to fill a 1TB harddrive.

Most companies have 1,000 users per day updating mostly existing data or adding small snippets here and there. That 1TB drive would die of old age long before your average company could come close to filling even 10% of the capacity.