Is Malwarebytes needed on my macbook pro?

Buildart wrote:

My MacBook Pro - 8.

Chip Apple M1 Pro

Sequoia 15.6.1

if you do not have an issue(?) then the rule of thumb is:

"if it ain't broke don't fix it."

You can read all about Macs built in security:

macOS antivirus - Protecting against malware in macOS - Apple Support

macOS - Security - Apple https://www.apple.com/macos/security/

Apple Platform Security - Apple Apple Platform Security - Apple Support

Protecting against malware in macOS

Protecting against malware in macOS - Apple Support

No, you don't need MalwareBytes.

There are no viruses that can affect macOS. None. There are no known worms, other than the one that was patched against over a decade ago. There are lots of Trojans, but you must download, install and run them. They can't get on your Mac by themselves.

Your best defense is your own brain. Read the following:

Effective defenses against malware and ot… - Apple Community

Virus Warning! What to do! and What is malware? - Apple Community are additional resources worth reading.