i have never done that tho, i mean investing in some coins made by anonymous developers. i just can't so i would love to hear others' opinions

Presumably you're not going to put money into closed source? If you do then you get all you deserve.

As for open source it's voluntary all the way down the line. A developer puts out code, miners run it, buyers buy their product. Everyone examines the code for viability. No one does anything with it if it's not good enough.

It doesn't matter who put the code out or what their name is. The only thing that counts for anything is the code itself.

If the code is shit then no one mines it and no one buys it. If an anon developer puts out shit code on an existing project then miners reject it and stick to the code that works, and more than likely a better developer picks it up.

That's the entire point of crypto.

for some reason, I see many privacy coins with anonymous developers.
is this logical? I mean, they're not doing anything illegal, and any criminals who would want to extort them etc, that applies for other coins too.
or is it just in the Spirit of Privacy?
sure, but then the project itself loses a bit of legitimacy?

The blockchain is a space that no one can manage. In the process you want to do has just you and the code of the person you are going to commit and nobody can put one's oar into your business. So this is a technology and i can not prove it, i mean, i can not tell you about a space i didn't see in the internet.

If I were you I wont trust anyone because there are a lot of people here in the world with different characteristics. We dont know what they are trying to do so if you want to be safe then trust no one.

That's the point. They are only showing their ideas and giving them to the community for verification. If even one person finds something wrong with the code, everyone will know about it. There will be articles on top of articles about how the devs are careless and proposing bugged changes. It's just not going to work and the devs know it. That's why everything they propose undergoes verification and is not going to be malicious.
I'm fine with them trying to improve the system and appreciate their work.

I completely agree with you.

two words: Open Source

now it only comes down to whether you understand the code and technology or not. if you do, then you simply check it out and figure for yourself whether it is a good project or not. it doesn't matter who the developers are, they are all anonymous to you even if they provide their picture and information! you first start with the paper to get the idea of the project and see if it is interesting them move on to the code and then more importantly you start using it to test the platform.

if you don't understand them then it is the matter of seeing how many of the others who do are giving feedback about it. for example you can find many on bitcoin and read them. in this case you have to be careful to find those who are experts and are giving unbiased opinion instead of finding some bag holders on the internet who are spreading bullshit to reach their purposes.

A coin is only as strong as it's code & community.

devs come and go, community support is what matters.

Dont give your 100% trust to those people who  are anonymous because we dont know what are their real intention towards you and other people. If that anonymous person would introduce their real identity then thats the time you would trust them. You must check their backgrounds inorder for you to be safety because their are a lot of people who are great at pretending.