Who is truthful and not a scammer?

I have noticed a lot of product creators who claim they have thousands of people on their email lists. They release a new product on Monday and then barely by the end of the week, they are sending out affiliate emails for someone else's product, even the long time in the industry like John Thornhill, and Kevin Fahey do that. To me it seems pretty scammy.

Can you recommend someone who does not do that?

They are trying to sell anything that sells with their funnel. If people didn't purchase one product, they might want to purchase a different one instead. Upsells, downfalls, whatever works.

The guru model is pretty old.
Read threads about the subject you fancy in the forum.
BHW is the best source of knowledge on IM you'll ever find.
(scammers are kicked out pretty fast)