My stupid little webgame https://368chickens.com went viral with over 200k visitors yesterday.

This is my first website that has received any significant traffic and I have a few concerns:

1. I'm hosting through cloudflare pages free plan - is this 100% free or will I need to pay something later?

2. I'm using google analytics - do I need to have a privacy policy or something?

3. The images in the game are from Canva - can I use the these without a license?

Many thanks to anyone that can help