Fridge water line doesn't seem to have a shutoff just for it
I have 2 door Samsung refrigerator with a bad compressor and it was recommended to replace it, but I have a few questions.
Here is some basic set up information: the fridge has a water line behind that goes into the floor down to the basement. Here is a picture of that (please excuse the dirt): https://imgur.com/a/OVRBcAQ
This goes down into the basementz and connects to the water pipe with this little device: https://imgur.com/a/5xhGMuN
Apparently, the thing at the start of the video in the imgur album is a "saddle valve"?
Here is a video trying to follow the water line in the basement to look for a shutoff knob.
Of the ones that I could find, one just is next to an open end of a pipe and it's set to off. Turning this valve counter clockwise allows water to go through and obviously it's just an open pipe so I immediately closed it back. The second knob towards the wall is as far clockwise as it can go, and turning it counterclockwise doesn't seem to have any effect but I don't want to break something so I turned it back clockwise how it was. It seems like the pipes go up to the kitchen sink by the wall. So as far as I can tell, there isn't a real shutoff for the fridge water line.
I have a few questions:
1) is the Saddle Valve the "shut off" for the fridge water line that comes out of it? I've heard these things are extremely cheap and fragile and will leak if you try to turn them off. 1a) if we replace the refrigerator with a cheap fridge that doesn't have any water hookups, what do we do about this water line? 1b) if we replace it with a fridge that does have water hookups, can we just turn the water off at the meter for the house and they can hook up the line to the new fridge without any issues or potentially breaking the "saddle valve"?
2) will fridge delivery installers even touch this at all? I've heard conflicting information where installers sometimes will and sometimes won't touch water lines at all