They didn't make it 'just' for themselves - it supports Windows, Linux and and Mac OS X on various (modern) architecture also.

I think at some point, if you've got a legacy application running on such an old platform, the cost of maintaining your own fork of libraries like OpenSSL has to fall on you eventually.

Although OpenSSL themselves continuing to maintain these ancient ports is admirable in a way, the unmaintainability it has caused to the code base as a whole is a serious problem that has reduced security for everyone.