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]