There is a neat workaround for getting old apps onto an old IPad. 1) you can gift from one ipad to another, 2) you can install the older app if you have bought the newer version but it wouldn't install. I did this for a friend who bought an ipad but couldn't get Goodreader (no longer recommend) to install because they pulled the version that works on IPad1.
I think companies should be required to release the encryption keys or provide a way to install software on devices that are EoL. So many IPads got "recycled" that could have been put to better use.
I think Goodreader could do the world a great service by selling a version that installs on first gen IPads, they make pretty good budget ereaders for pdf content.
In my case, I came across my old iPad recently, reset it and was able to install Hulu, Netflix, Crackle, Google Drive, Plex, Spotify,and the CW app
Edit:
I was also able to download Apple's productivity apps -Pages, Numbers, and Keynote.