Your mentioned signs to avoid a scam project are indeed valid. However, there are instances that contradict these principles, such as Bitcoin, where we do not know who Satoshi is, yet it has been successful up to now. Therefore, we cannot immediately deem a project as a scam just because the team is anonymous. Perhaps, it really boils down to luck when choosing crypto projects, but thorough research remains essential since there are undoubtedly some projects that are obvious scams. Additionally, I would like to emphasize the importance of "investing only what you can afford to lose."
Yes. you are right, anonymous is not a measure and justifies outright scam. Today, there are 1000 new crypto coins that have appeared in the last 5 months. are we going to say average they are scam all. certainly not. There must be potential, of course, and it needs to be looked at carefully and thoroughly for sure.
They are essentially not but they are prone to being scam given that they can run anytime. There are many anonymous defi projects out there that still exist but among the total anonymous projects exist, only a very small percentage of those projects becomes legit. Remember those money making projects back then that has a completely anonymous developers? Where are they now? One factor before I personally trust a project is the project team background. It is one of the first thing that I am checking before investing on a project and having an anonymous project, I can't verify them and that's why I don't invest on that kind of projects unless they are established already and fully functioning.