Why is accounting for individual entrepreneurs on the simplified tax system free in the module-bank, and paid on the PSN?

Question

Electronic accounting

It seemed to me that accounting for PSN is the simplest, easier than on the simplified tax system. But for some reason, the online accounting of the module-bank is free for the simplified tax system and paid for the PSN. I do not understand something?
In fact, all I need from accounting is maintaining KUDIR for currency payments. Expensive accounting is seen here as "from a cannon to sparrows."

Answer 1

PSN is much more complicated.
STS is just 6% + 1% and that's it.
PSN - according to your codes, PSN must be calculated, if your money goes according to other codes, you must apply the simplified tax system. This is where things get very complicated.