I'm of the mindset that it should be possible to rub code written 20 years ago, but not always the same way you run code written more recently. Emulation, virtual machines etc all allow access to old work without hobbling future development with backwards compatibility concerns (see: Windows).

In this case, there are plenty of free and open source options for FTP clients. No one is going to have the world closed off to them as a result of this.