On the talent network, I saw many game companies recruiting. Many recruitment requirements require that I can use unreal engine, so I won't have a chance to enter the industry if I can't use it?

Not all game companies have this requirement when recruiting, depending on the specific company and specific project needs. Some companies have their own engines, some companies buy them from unreal engine, and customers of some outsourcing companies may need to use unreal engine.

When the project needs to use unreal engine, these companies certainly want to find people who are familiar with engines. Recommend a forum: LHGAMER Forum, in which there is a special section called unreal engine, which specializes in studying and discussing relevant cases and technologies in unreal engine. It is a very professional Chinese unreal engine discussion forum in China.