The thing is this was the pitch for buying clothes online: worried it won't fit? Just return it. No questions asked! We'll even pay return shipping!
It's interesting how companies are now redefining things they explicitly encouraged their customers to do as "abuse."
Well we don't know that they're talking about clothes at all. Clothing retailers are still pretty open about returns afaik because it's kind of the only way to run an online clothes store people will actually use.
The few cases where this is an advertised arrangement should be excluded from the usual situation where returns are meant for defects/errors.
Even then, the one clothes example (shoes - which had been returned stained and with socks in the box) mentioned in the above still wouldn't seem like a valid return by any stretch.
The GP described it as abuse. That's not evidence of companies calling it abuse. As you say, this is basically intrinsic to the deal of buying clothes/shoes/etc online and obviously online retailers know that and accept it, or else they would not allow it (and in turn would not exist as businesses).