Don't steal. That's pretty simple to understand.

If you download a free font, you can use it in any design or map you want. You aren't violating copyright. Since they put the font out there for free. That is the end purpose of fonts.

If you buy a font, you can still use it in your designs and maps. Without violating any copyright.

DON'T give the font files to someone else. THAT is violating your agreement with whoever sold you the font.

That's it.