1. Any recent invite changes?

No

2. Emergency*ratio-saving tips?

As i already pointed out in the review description the tips are to
-upload
-fullfil request
-wait until they distributed freeleech tokens to download what you want
-seed forever.

3. How risky is it really? Precautions?

The only safe way to join is only by interview,recruitment or a good friend who knows you in real life.

4. How often does single-seeder*freeleech*happen?

Very often.

5. Any urgent staff/policy updates?

Can't think of anything for now