Are there really any true crypto recovery services? Keep in mind, if you are in trouble with recovering your wallet, most of the recovery services are just scams. There was a recovery service on the forum that was legit, but I can't remember the name.
I think you're talking about Dave's recovery service.
The rest of the crypto recovery services look like just scams, especially those that are asking for something upfront. A real crypto recovery service would be costly, because they will have all of your credentials. It means you are trusting them with everything, and they will return your funds as per contract. So be very, very careful before handing over your wallet credentials to any recovery service.
Credential usually implies custodial wallet/service, so people better contact customer service of such custodial wallet/service rather than unknown third party. For non-custodial wallet, recover usually ask for your wallet file.