Development process – where do the developers of programming frameworks and packages receive money from?

I am a beginner developer who has been studying various recent programming language frameworks such as Laravel, Vuejs, Flutter, etc. lately. As we know, these frameworks still contain many packages or other dependencies that make it easier for programmers to create programs.

However, I'm curious where the creators of the framework have the money from? Is this framework not free (open source)? Even more curious about me, where do the developers of the packages from the framework get the money? These packages like vuetify, vue swall, faker, jwt auth, oauth, etc.

Actually, I'm very interested in creating packages for specific frameworks. But I sometimes think, what benefits can I get after I can make the package? Is it just a feeling of pride, because the package is used by many people? Or just wait for donations to pay me?

Security – Whose intent is it to stop coin bank developers from charging all accounts and running away with the money?

The same kind of business confidence and legal things that run a stock market or a bank, I suppose.

There has been an exchange in the past that did exactly what you said, and they were just as legally prosecuted as any other business that cheats on its customers.

Here are some links: https://www.coindesk.com/six-arrested-over-cloned-crypto-exchange-that-stole-e24-million

https://medium.com/datadriveninvestor/investigating-the-40m-binance-hack-c5fba32900f1

In addition, at least in the case of Bitcoin and Ethereum, the currently two most valuable crypto, and the more money they can hope for, the harder it is for them to transform that crypto, back to fiat with every transaction in the blockchain.

You also need to keep in mind that most experienced crypto users advise new users not to exchange their coins and instead store them in a safe off-line location, owning our money and replacing the bank, which is one of the ideas behind cryptocurrency The problem you are describing is one of the reasons.

What are design considerations as API developers / engineers when creating private and public APIs?

In my previous company, I created APIs that were primarily intended for (public) customers. At that time I was new to designing and joined after endpoints were already created, so I could not participate in the discussions.

Are there any differences in the considerations that normally consider developers / engineers / architects / companies / companies when creating private or public APIs? apart from the safety?

javascript – How do developers add "Smooth Transitions" to their websites?

Question:
I've noticed that some websites (such as Microsoft Teams or Microsoft 365) have this "Smooth HTML Transition" effect, leaving the site content loaded when a link opens, and only the inner content being updated.

ETC:
What I ask is, does anyone know how this effect is produced, and if so, does anyone know exactly how to do it yourself? For example, my site has an upper navigation bar that exists on each of my pages except the debug window, but that's not a page that matters to me. So I want to see that my top bar and the page background stay loaded, but the content in my To update.

Requirement:
Not much here, I just want an effect that keeps my HTML from unloading and reloading when I open a link to a page that is similar to the main index.html of my site core, so only the inner content is updated.

Bonus:
I also found that sites like the ones above are "running a little offline" and seem to cache their files on the computer as if I were switching to Microsoft 365 on my school laptop without Wi-Fi. I open the website and it loads, but it only shows "Sorry, No Connection"

How to use the free Wolfram Engine for developers running Linux for Windows?

I just downloaded Wolfram script for Windows. I have WolframEngine_12.0.0_LINUX.sh. I tried to do it, but it showed me
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I'm using it, but it showed me too
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I'm sure the file is in the folder, but I can not find it. How can I? Please help me.

I've read all the websites I can find, but no one has told me why there is no file.