Comment by Theodores

Showing a laundry list of logos is not testimonials. Testimonials are more like reviews, a different type of social proof where you get a few words about how the product solved the problem and how the company stepped up with customer service when it was needed.

In reality, these company logos are always going to be deceptive. If one person at (say) IBM used the software for a minute then why not slap the IBM logo on there? Or, if someone with a Gmail address used the software once, then why not slap the Alphabet logo on there too?