Malwarebytes is accepting bitcoin before but right now they remove this as another payment option. Avira is also accepting bitcoin but not now maybe last year but this year they are not accepting any crypto.

My best bet if you want to buy well-known antivirus like Kaspersky and pay with Bitcoin you can use Newegg they accept bitcoin as payment.

Here's the link below.
- https://www.newegg.com/p/pl?d=antivirus

Or use bitcoin Debit/Credit card to buy directly.