When I worked at Microsoft, it cost over $20 to have a human customer support agent pick up the phone when someone called in for help. That was greater than our product margin. Every time someone called for help, we basically lost the entire profit on that sale, and then some.
Most common support calls where for things that were explained in the manual, the out of box experience, tutorial documents, FAQ pages, and so on and so forth.
Did we have actual support issues that needed fixing, yes of course. And the insanely high cost of customer support drove us to improve our first use experience. But holy cow people don't realize how expensive support calls are.
Edit: To explain some of the costs - This was back when people worked in physical call centers, so first off we were paying for physical office space. Next up training, each CSR had to be trained on our product. This took time and we had to pay for that training time. We also had to write support material, and update that support material for each new version that came out. All of this gets amortized into the cost of support. Because workers tend not to stay long, you pay for a lot of training.
Add in all the other costs associated with running a call center and the cost per call, even for off shore call centers, is not cheap.
In a reasonable world we'd just raise the price of the product by $x based on what % of people we expect to call in for support (ignore for a minute that estimating that number is hard), but the world isn't reasonable. Downwards price pressure comes from all sides, primarily VC backed competitors who are OK burning $$ to gain market share, and competitors at other FAANGs that are OK burning money to gain market share.
The result is that everyone is going to try and reduce support costs because holy cow per user margins are low now days for huge swaths of product categories (Apple's iPhone being a notable exception...)