(a) You've misunderstood. It isn't "10 people ever": it's "10 people often". Unless you're requesting an ongoing relationship, the answer is "no".
(b) What is trust? Examine the nature of trust, and you will see why "you can trust FOSS" is a truer statement than "you can trust Microsoft software". (Neither are true, in my opinion, but I have a higher standard for "trust".)
I happen to trust Microsoft software more than FOSS en-masse. I think Microsoft FOSS software is more trustworthy than either, for instance I have high confidence in VS Code as an editor. It helps that I've read through most of it's code and authored a good chunk of it as well.
(b) What is trust? Examine the nature of trust, and you will see why "you can trust FOSS" is a truer statement than "you can trust Microsoft software". (Neither are true, in my opinion, but I have a higher standard for "trust".)