Ghosting a company is small beans, next job cycle I'm sending copy pasted form letters waxing about how impressive the company is, however I've decided to move forward with other companies at this time.
This is largely because companies are no longer vested in growing and maturing talent. Used to be that they hired and trained, now that is all on the employee to skill themselves up for the laundry list of things companies want. So instead of training and learning about people and evaluating them as you go, the interviews have become the surrogate for what used to be done while training. You could take any engineer and make them viable, they used to have to because the market was so small. But now they complain about not being able to find good people, because they don't want to put any effort into someone. If we look at this as a human relationship, like if this were how you looked at your spouse or partner, you'd realize you're being a dick and probably just using the partner. This has become normal, but is toxic in the long run. But hey the only way to get a raise is to leave, which is another data point on toxicity and clearly shows the fundamental switch away from healthy relationships and quality organizational building.