We use contextual ads and have never had any problems. There was a case when we launched a pre-land that did not meet the requirements, the manager contacted us and politely explained what was the violation from our side, how to fix the creative to increase the conversion, which subsequently really worked better. Nothing about any bans was out of the question. We got a warning, though maybe it is not critical for them, why should we ban a partner who gives traffic and is good at attracting traffic? As a result - we have been working with Kingfin for more than a year and everything is fine.