If you buy a widget without guarantees you expect it to at worst not work, but if it actively sabotages the rest of the site, steals user login cookies, runs a

If you buy a widget without guarantees you expect it to at worst not work, but if it actively sabotages the rest of the site, steals user login cookies, runs a crypto miner then it's a different thing altogether. Similar a apartment might be faulty for all kind of things but if it is build on toxic wast, which on itself shouldn't have been legal without making sure the wast is contained, it is a different matter altogether. Especially given that whoever know that there was toxic wast was actively endangering the health and potential live of tenants. Just consider your widget instead of just not working to arbitrary start playing flash lights in a way extremely likely to cause serve epileptic seizures... EDIT: Or in other words, you might not guarantee the quality of a pice you sell, but this is a different matter altogether then trying to make people unable to sue you for things they rightfully can (like endangering health/live).