I do not understand what does "5,000" email limit means?

Does that mean that we only can send to 5,000 prospects a cold email to every month or?

What does "5,000 uploaded / prospects contacts (Re-usable anytime)"

Actually mean?

I'm moving out of Instantly.ai so I want to know that.

I need to know if i buy doyoumail.com from you guys - will I be able to use 100 cold emails into your ecosystem?