We are neutral towards your SEO.
Google looks at signals of how visitors are using your site, for example: bounce rate, time on site and click through rate.
Reactions help engage with your site visitors to decrease bounce rate, increase engagement and click through rates - which helps you positively impact your SEO.
With strategic implementations like pairing triggers such as timer / idle / hover, with layer Reactions such as notifications / tooltips / and banners - you can make sure you are not negatively affecting your SEO. These overlays don't cover up website content and can provide messaging that help the user experience.
As Reactions also make use of proper content from the website and not ads or spam, they are unlikely to have any negative affect on SEO.