This seems to be a no strings attached good deal on xQc's side given the lack of exclusivity clause. Worst case scenario is a particularly bad scandal hitting the platform could tarnish xQc's reputation ~~such as it is~~ but that's a risk for literally any platform. However...
As a start-up, Kick is prepared to operate at a loss
Aaand the platform is doomed. Focusing on growth over viability is whats makes you a prime enshitification target.
On that note, upvotes and downvotes upvote matter even less here ("here" meaning kbin) as the factor dictating comment order in the "hot" ranking is boosting (think retweet equivalent), not the vote count.
Not sure how that goes on Lemmy though.