score:1
According to nomadwallet.com, it's ambiguous:
Slippers tends to get left behind, although hotels generally want you to take them home. If you donβt, theyβre going to the trash after you leave.
However, there are exceptions to the rule; some hotels reuse their (usually nicer) slippers.
Personally, I think this site is quite liberal about freebies. I don't take slippers. I don't know whether most hotels actually trash them after you leave.