Depends on your meaning of success.
Advertisers are typically focused on the end action (typically a purchase of some sort, or a micro [trans]action on the path towards a purchase)
Pure video views / completes aren't compelling if it's completely divorced from whether or not the user will take the intended action and savvy advertisers will take this into consideration.
Incentivized videos tend to have a low correlation between video views and actions taken. Over time this has turned into an industry-wide understanding that incentivized video is just not a good buy.
As an aside, unskippable video has similar issues.
As a vendor you're probably thinking of your "product" as units of complete video views but that is not how your customer will be thinking of it.
There's one situation where I think incentivized views could be worth it -- if you're a big brand interested in doing heavy brand awareness in a "cornering the market" kind of way, it's effective at getting people to watch the same video 30+ times over the course of a week. Which over time, if you believe in the subliminal/subconscious/mild brainwashing part of ... Frankly all modern video content (compared to the amount of stimulus a human mind was actually evolved to deal with), would be very effective. But that would be a pretty difficult client / set of clients to land since those folks are also usually shopping "premium inventory" typically, and you'd need to be able to offer significant & stable scale and get over the issue of inherent bias against what is considered currently, bottom of the barrel inventory. The scale problem is also not insignificant.
Personally I do think a lot of advertising does fall into that mild brainwashing/persuasion/Overton window thing, and consideration based advertising (where you actually talk about features instead of an emotional hook) has a finite limit to how many people it can convince, vs. the emotional approach. So maybe it is undervalued. But your client's marketing team would have to be very good at justifying that to their finance team etc. etc.
Sidenote -- this works for mobile app games promoting mobile app games because usually the price of the action is zero / close to zero, and/or the app actually makes money by selling ads. And there's high alignment in interest. But for non game advertisers I can't see it really working out