Are Curseforge Mods Safe?

Yes but curse and curseforge are safe places too because the mc forums uses curse.

Is forge mod installer safe?

So, in conclusion, Forge is highly recommended to be safe to use and any and all mods found on the official Forge website are good to download and use without having to worry about a breach in security or unsafe content being downloaded.

Are mods on CurseForge free?

It has mods for those who like to explore, mods for those who like technology, and mods for those who like to build. This means that anyone can play the pack. It's a Free-for-All pack where you can do what you like with it.