Not all B2C is the same. If you make a product for professionals you won't get random chargebacks, incoherent emails, or general rudeness. One great way to filter for professionalism is by simply charging more. Another strategy is making it harder to purchase the product. For example by disabling the checkout process until people have completed the tutorial, or only allowing purchases after the free trial has expired…
The proportion of negative/wild interactions with support and chargebacks is always going to be in an uphill battle with positive correspondance unless you are selling multi-seat deals with support as part of it. I speak a little out of my area of expertise here but from my friends experience, the downside to professional services is that a small proportion of people, or people on bad days, see it as a service, not a SaaS, and will willingly throw threats, insults, etc at you. A small error on your service can stop their whole business which is different for B2C - it's the difference between fear and frustration.