How safe is Apple Support Community from hackers and scammers?

I am not sure what you mean. We are pretty good at policing, both the Apple moderators and us users. If anything hinky should show up, we would shut it down or point it out pretty quickly.

Hello ~ Perhaps if you could let us know what your concerns are that would help in assisting you.

~Katana-San~

Define your terms: hackers and scammers

I completely agree with this.