alt Hacker NewsArticles like this remind me of that Innovation Tokens article.
Your time and attention is precious as a developer. I'm absolutely sure it's possible to implement uniqueness constraints, transactions, indices, and history yourself, but is that really the most valuable use of your time? There's probably not a need for you to have a unique solution, so you're quite literally just re-inventing something someone already had for not a lot of benefit.
Wouldn't your time be better spent actually solving the problems that whatever you're building is supposed to solve?
Development of video games is the final boss of this one.
If you want to kill someone's dream of publishing a game, encourage them to build their own engine from scratch. I cannot think of a more malicious piece of advice given how effective it is, statistically speaking.
The exceptions to this are so incredibly rare. Virtually all of the in-house engine work at indie scale has been replaced by Godot in recent years. It used to be something like 10-11% of studios were in-house fully custom. Now it's probably closer to 1-2% fully custom and 8-10% on Godot. Having a reasonably stable OSS option has removed the last major argument that I am familiar with for simply using what already exists.