Unable to remove "ask you" from list in Notifications Center MacBook Ventura

Safari >> Setting and refer to below image.

Remove and or block the unwanted Notification Site

The items in that list are not the source of the notifications. The app is the source of the notifications. The list just shows you what have registered to send notifications so that you can enable it or disable it.

You need to uninstall the app you installed that is putting up notifications.

If this is genuine Adware / Malware then the user ( you ) was tricked into downloading and Installing this software.

Predicated on that as being accurate >>

Effective defenses against malware and ot… - Apple Community

There is Adware & Malware which will affect the computer and is generally downloaded from “ Shady “ Websites or Developers who Inject this software into the download.

Should “ Certain & Specific Software “ referenced from above be installed - it will negatively impact macOS. It is suggested, download directly from the Developer , the application Malwarebytes for Mac. 

It is free or paid for added features. 

Run the Application and it should remove the malware / adware. Once done, restart computer and test.

I am not sure how you will receive this and please, it not meant to be a flippant reply.

There is a certain level of expectations that the user will be aware of some of these Bad Actors and just what they try to do to you and your computer

For that reason some More Learned Colleagues have prepared some user Tips to help education person on such issues.

The first was already suppled and is a really good starter

Phony "tech support" / "ransomware" popup… - Apple Community

As for Apple's role in this >>

Then have a suggestion ;

Product Feedback - Apple and make it known to Apple regarding this ongoing issue  and request a change to the Operation System

To be forwards on your last point

As Apple is developing a newer version of macOS 14 at this time.

It would reasonable to believe they have moved most of their Resources to developing Sonoma macOS 14

EDITED

professarap wrote:

Ah, phew! Thanks, that finally took it out of the Notifications center! (and I would have thanked you sooner were it not for these ridiculous posting limits -- you'd think there'd be some credit for having been a Mac user since 1984!)

Welcome

I have been here since about September 2005 and look what can be done, with a little effort

Another dubious Developer has also found a way to Trick users into allowing Notification

mcafee malware - Apple Community

Then, follow the suggestion from @Barney15-E in above reply to your question

thanks to you I just got rid of the danged thing. this is the first thing I could find that said it was not an app to be deleted!