"Does it have a way to uninstall, and does that uninstallation clean every application artifact?" is such a great litmus test for just how much a software company actually cares about having a proper finished product that respects the user. Nobody forces a company to do it, but when they don't do it, you can probably bet that they're cutting corners and disrespecting the user's machine in other ways, too.

It's like "Do you return your shopping cart to the cart storage or leave it in the carpark?" You're allowed to just shove your cart away and drive off, but people who do that are highly probably assholes in other ways, too.