Probably because old habits die hard. Kaspersky used to have a pretty good reputation as far as AV software. In the past, I used TDSSKiller to resurrect many PC’s where other antivirus software failed.
Unfortunately, the whole Russia being a malicious actor negates any reasons to continue using Kaspersky.
Not nearly good enough to make me give up Quicken but it is nice to see some more self hosted options popping up.