Earlier quoted context omitted.
Few companies take money to help bypass the function of their product! This is analogous to an antivirus vendor taking money from malware authors to avoid detecting the worm of the day, the only difference being that a text ad isn't as likely to frag your computer. But hey, in both cases, they're getting money to "maintain and improve the product".
This comparison implies that everybody can get their ads on that white list, for money. But that isn't true. There are guidelines that define what is acceptable ad and what not. [1] Everybody that gets on the white list has to conform to that guidelines. So it would be rather like an AV software that lets by default, installers still change your default home page (or stuff like that), if the installer is fair enough…
You have a disturbing amount of trust for someone with such an amazingly blatant conflict of interest.