A difficult balancing act, especially in the bicycle industry, is the compatibility of inexpensive production and sustainability. And without naming names, some online retailers in Switzerland are doing an especially terrible job with it. It doesn't always have to be the most expensive option, but there is a reason why the cheap things cost less. This is often not communicated honestly, if you're interested you can read more about it here.
From an environmental point of view, it is a disaster throw away a bike 3 years after purchase. This means that if you decide on a cheap bike, you have to be prepared to invest in some maintenance time yourself and regularly bring it in for service.
Regarding repairs of components (e.g. a defective inner tube), it is unfortunately often the case that renewing is cheaper than mending. We replace where it makes sense (e.g. that tube) and otherwise encourage our customers to go to the extra expense of the repair route - but the decision remains with the customer.