The Red Hat/CentOS/Fedora distros are very paranoid. The HTTP and HTTPS inbound ports are blocked by default. However, if I'm not mistaken, when you install webserver packages like Apache httpd and nginx the installer adds exceptions for the HTTP(S) ports. I could be wrong or at least out of date, so it's a good idea to check.
Most outbound requests are going out through a randomly-selected high-numbered port, so there usually aren't any blocking rules on the OUTPUT firewall chain.
Being persecuted doesn't in any way prove your righteousness or your beliefs. Many people get persecuted because they are repugnant or annoying. Or just because they can be.
I didn't do it. You can't prove it. Nobody saw me. The sheep are lying! This tiny ad is my witness!