There might be a cultural issue here for the Dems. Many of the canvassers I met who were not retirees tended to be young women, often college-aged or a bit older, very liberal and very much benefitting directly from the economic status quo. To them, voting for anyone besides Harris was just completely insensible and they did not even bother to try and understand the views of anyone they spoke with (from what I could…
As I understand it, in the US, "get out the vote" efforts don't count as campaigning, so they aren't subject to campaign finance laws. Attempting to persuade voters to vote for something or someone in particular, or even trying to understand their views, would likely put them in a different organizational category.