Uniswap is a decentralized crypto currency exchange. Aave is a lending protocol where you can get a collateralized loan. There is many others.
In fact those cryptocurrency are decentralized apps themselves. All of this combined this millions of transactions every day.
Stripe do hold money on account of other people. When a customer pay, it does hold the money sent by the customer until your forward it to your account.
Why to charity? Give it to them directly. That being said, you'll create bad incentives: for a team to create badly optimized infra cost then to reduce it and cash in the difference.
It's strange how this man his revered by a few cinema nerds and despised or ignored by the vast silent majority. I found the few movies of him I watched just plain boring.
Maybe this article explain why: because to appreciate Godard, you need to deeply understand the code of cinema. I don't know them, couldn't care less and people don't care either unless they are cinema nerds. But if you understand cinema code, you can understand how he virtuously play with them.
I'm on the opposite side of yours. I believe that blockchain has a bright future as a currency, but not in logistic.
Blockchain money is great because its inflation is very predictable, everyone can use it without permission (versus the slow banking system).
I don't believe in blockchain in logistic because database corruption has never been an issue, the problem has always been that people did not insert any data or corrupted data in the database. Blockchain only insure that the database won't be corrupted (not that the data it uses are correct), so it doesn't solve the main issue of logistic.
Since most developers started programming because they dreamed of becoming a game developer, you should create a course to create a game engine by yourself. It sure would gain a lot of success.
If it's done on my spare time, I don't have time to create proper test suite, proper CI... This is done for me by CodeCrafters. It helps save a lot of time.