If you turn off iCloud photo sharing all together do the photos get deleted off the other devices as well? Do your subscribers you turned it off?

So will other subscribers still see that album on their phone? Like they won't know if you turned it off?

Yes.

Do your subscribers know you turned it off?

No

Also will I still show up as owner of the album if I turned off iCloud photo sharing?

Yes

Don't forget when you turn off iCloud photo sharing, you only turn it off on that device (just like iCloud photo library and photo stream)

I haven't confirmed this by doing it myself but I believe the shared albums remain in the cloud.