When does marketing hide internal problems?

It confuses me that many sites focus on appearance and marketing, but almost do not disclose the internal processes. Everything looks too perfect, which is suspicious. Do you consider this a normal practice or, conversely, a sign that there may be problems behind a beautiful shell?

Beautiful design and marketing often hide the real processes. I learned how to check the platform based on real reviews, payment history, and quality of support. The https://spin-macho.org website, which is an online casino, was pleasantly surprised: externally, the site is simple and user-friendly, and the internal processes are transparent and honest. For a long time of using it, there was not a single case when I felt a catch or an understatement.