Most Open Source software is written by corporations. The Open Source licenses are an advantage to them.
The biggest source of GPL software is probably Red Hat (IBM). They maintain most of what people think of when they think of GNU software and they wrote many of the newer GPL projects that everybody uses (like systemd).
The trend has been towards permissive licenses for a long time. The have led to more Open Source software, not less.
Look at Clang vs GCC. Clang attracts a greater diversity of corporate contribution and generates greater Open Source diversity. Zig and Rust appeared on LLVM for a reason.
What we should be worried about is the cloud. It allows big companies to outsell the little companies writing Open Source software. Neither permissive nor copyleft licenses prevent this.