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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.