I stopped using Emacs long ago for things that make my life much easier as a developer, like VSCode. Now, with the ability to remotely save code over SSH, I don't even need to edit anything directly on the server.
Back then the package was called ange-ftp. It was superseded by something called efs (same author), then later by something else, which I still use occasionally.
I quote:
Unless applicable law gives you more rights despite this limitation, you may use the software only as expressly permitted in this agreement. In doing so, you must comply with any technical limitations in the software that only allow you to use it in certain ways. You may not
* reverse engineer, decompile or disassemble the software, or otherwise attempt to derive the source code for the software except and solely to the extent required by third party licensing terms governing use of certain open source components that may be included in the software;
* remove, minimize, block or modify any notices of Microsoft or its suppliers in the software;
* use the software in any way that is against the law;
* share, publish, rent or lease the software, or provide the software as a stand-alone offering for others to use.