How does no one notice that the Prophet did not marry any other women when hazrt khadija was alive & started marrying so many women once she was dead?

For 25 years, from the age of 25 until he was 50, the Prophet was married exclusively to Hazrat Khadija and then, after she passes away, he marries multiple women within a relatively short period.

I have heard the argument that he married poor (widowed) women to help them financially but apart from the fact that not all of them were poor (nor widow), he also could have helped them financially without marrying them. right?

what other arguments are there, I am of the view that he certainly could have helped those women (if they were in need of help) without marrying them.