I personally use old climbing rope for my slack anchor. It woks well for me since I normally just set up slacklines under 50 feet with 5 biners, so a longer line with pulleys could be problematic. Also, I hope it goes without saying that you shouldn't use retired anything for high line anchors
I will admit to being a slackline newbie, but I had trouble getting even static rope to work well without stretching. I switched to webbing for the anchors, too. So at least for me, I wouldn't even consider dynamic rope.
disclaimer: I'm a mediocre climber and a crappy slackliner, so my lines are about 30' long and kept tight.
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