How do I politely tell my friend I don't want to be involved in the pyramid scheme they want me to be a part of? [I Need Advice]

They either are not your friends or they are also being suckered into the pyramid scheme .
Tell them NO!
You need not give them a reason. Just say No!

Tell them flat out. It is a mistake to get involved in a thing like that and you are not gullible enough to do it.

Start with, "Listen, shithead..." and go from there.

The reason they're attempting to recruit you is because they know you're polite and are easy to manipulate. You don't owe anyone who attempts to use your friendship in that way any polite explanations. Tell them it sounds too much like a pyramid scheme and you're uncomfortable with it. If they press you further, tell them it's not for you and it's the end of the discussion.

Lost 2 friends years ago because I wouldn’t go into a similar business venture several years ago

I hate scams like that... They push your friends to recruit you. You are likened to a pawn.

So tell them...
"I don't want to commit to anything right now as I am concentrating on finding steady employment providing a steady income and benefits."

I can guarantee that their "mentorship" doesn't provide benefits... so that is your "dealbreaker" as to why you can't accept their offer.

I got a presentation like that once.... I just told them "With full time school and a 48+ hour a week job, I just don't have time for anything else."

'hey, let's google them and their better business rating... '

I have the same problem. I flat out told her I’m not interested in that. Please don’t continue to ask.

Although you will likely gain lots of transferable skills from that line of work

Ponzi scheme

Just say it’s not your thing

Say "the business seems dubious and illogical"