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Nope, It's not.
We already have (Dinabot) similar like these but people should aware, they're dealing with third-service provider. If you doing a trade, and there has some problem especially case like (Scam, etc). Stake are not gonna to help you cause you're dealing with third service.
Those are indeed 3rd party service, but they are working with the API access from Stake team. Moreover, both of them don't accept big amounts for the exchanges. I think they are not here to scam, their main goal is to generate some profit from the exchange fee. However, it is true that Stake won't be responsible if anyone get scammed by these 3rd party service. Do you think that they are going to scam the user of Stake? Dinabot has been working since 2018 or 2019, there were some reports about the delays from the users. We haven't seen any scam report against them.
I don't know anything about Dinabot, but concerning poorbot which was recently launched on this forum, I think they don't look like a service that is here to scam, they clearly stated in their thread that they are a third party service and not related or affiliated with Stake in any way.
This information they provided for their potential users makes me believe that they are actually genuine, and they also have launched a signature campaign on this forum, that proves how serious they are to serve the gambling community, and users of Stake more especially.
And besides, exchange services for casinos is a good business that could generate good enough profit for them if they manage their users well, which I believe they would.