open-source curl, or corporate curl? Apple and MSFT build their own replacements for TLS and use those, others? part of a trend to replace and extend GPL softw

open-source curl, or corporate curl? Apple and MSFT build their own replacements for TLS and use those, others? part of a trend to replace and extend GPL software, and control critical network functions on their platforms ? but then, others seem to want to make TLS, too ? [ Windows native SSL/TLS, schannel ] [ Apple OS native SSL/TLS, secure-transport ] [ GNU TLS ] [ mbedtls, wolfssl, mesalink, bearssl, rust-tls, nss]