It may seem like a complicated product, and I'm sure the guys behind it put in a lot of work to polish it, but the guts of the product are 3-4 well-established open-source libraries wrapped together with duct tape.

Here's a shameless plug to something I built, as another example: https://smsinbox.net

patio11 was kind enough to give me some feedback about that when I was getting started. I successfully charge businesses $75+ per month to use it, and although I'm proud of the programming work involved to build it, it is not substantially more complicated than BCC.

EDIT: I noticed your comment on Indie Hackers about not feeling as qualified for B2B since you don't have a lot of experience working for companies. One way to tackle this is to build a product that participates inside a bigger ecosystem (Wordpress plugins are an example, or Shopify plugins or something like https://baremetrics.com/ in the Stripe ecosystem or my thing in the Twilio ecosystem). The awesome side effect of this approach is that it often simplifies distribution, since there are already communities established around those platforms.