No way to be sure? It is absolutely sure that they are harvesting every bit of data they can from you.

My wife was shocked when she googled herself and found information that could only have been obtained by reading all of her emails. I explained that Gmail and other mail services are not charities, and if you’re not paying for them with money, you are paying with something else.

The whole picture looks bad, like an AI rendering from several years ago.

You might want to look at something like Drupal as an alternative to WordPress. Drupal tends toward a lot more open source for its plugins (which they call modules). As a developer myself, I also find it better engineered than WordPress, although maybe that’s just because I used Drupal more.