I don't think this is how people's relationships work. Putting a number next to someone's name doesn't make this person more or less reliable. The only kind of recommendation that is trustworthy is the one made by someone you know.
The idea is interesting, and it's good that people experiment with such ideas, but I'm skeptical that this scoring concept isn't going to make people miserable and possibly going to be gamed easily.
A better way to compete with LinkedIn would be to simply get rid of the social media feed. I'd find LinkedIn much more pleasant if it wasn't full of trite platitudes, cringey corporate signaling, political grandstanding, dudebro philosophy around productivity, and so forth.
Perhaps the TRU Score is not the "perfect" solution, but I think it's far better than a simple star rating. How many times on HN do we see posts about people "buying" ratings or followers. As a result, people lose trust in the value of the rating system. So, we have created an alternative that we think people can trust.
A future release has planned to use Stripe Identity. Whereby, you will have confidence in the profile you are viewing and can make an informed buying decision. As designed, manipulation of the TRU Score [when combined with Identity], will be difficult.