Is there any actual reason for Yahoo! Answers shutting down?

Because there were less and less users... And those that did still use it were juveniles and bullies. Once upon a time, Y/A was a forum where you could get serious informed opinions and discuss reasonably with others. That's not been the case for far too long. 

Yes since Verzion Purchased it they have Not been able to make a Profit

they Took the Green and Ignored our request as people left

even in this day and age if i Go to my Local Library and ask for a Book they will Look at the Price and ist Viability before saying sorry No

YAnswers is not a "service" . . . it is a product designed to generate income from the sale of advertising and information about its users.  Things that don't generate sufficient income to justify the resources they cost are discontinued.  As it turns-out, there's little income to be made with a user base of foolish children, trolls and imbeciles.

Republicans are always crying about cancel culture. Maybe this is that?

Yahoo says it is not popular anymore and the increasingly huge amount of poor content has made it a target for ridicule.