Actually, we can't be 100% confident that the project is legitimate because on average all projects use this, such as verified on Twitter and Telegram. I have joined projects several times, on average, I use verified between the two, maybe both of them help them to notify updates to the project community. and we have to be careful in choosing projects that ask for that
Yes, not all 100% verified badges on social media are for real. They can easily be claimed and bought because it's a feature that you just need to pay and you get that verification confirmation of having that badge. Aside from that, this is another way for the new projects to get verified without having to launch the project, a real project. As long as you have money to pay for the monthly subscription, you'll be thought that you are a legit one.