You are lucky that 1 of the developer help you to recover your passphrase that i think its impossible to me to see there are devs that can contact personally and giving legit service.. i was thinking that what wallet you used that you forgot the passphrase and seeds?
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I think you are off-topic this is not a topic related to your concern..
It is good thing to know that your BTC got recovered with the help of dev. Happy for you. So this is kind of lesson to everyone that we must keeper private keys and passwords stored in safe place. Like we should copy it on 3-4 places I would suggest. With me same incidence happened but it was worse than this. I lost my keystone file related with myetherwallet. My wallet had around 640 CRB tokens which was recently at the top of every coin in the market. I had bought this CRB's at initial price of 3-4 cents. The coin had pump of 1.7 dollars when I lost my keystone file and I was not able to access my account (still it is locked). So with that much pump I now lost my 1300 dollars which are still out there. This is very disturbing stuff and since then I'm saving each and every password and keystone files to safe place. Thats lesson for me and you guys as well.
Well there are times that people forgot or they don't care about their passphrase or seeds because they are still new and i think they will learn after they experience it just like what happen to me before that actually i never recover back my bitcoin its not a big amount or small amount but i forgot almost all passphrase seeds and deleted the wallet.dat because i was new before i am just in trial but when i was stay long using it i forgot the passphrase and the seeds where i put them. now i realize getting backup is always important..
How many bruteforce attempts per second can dave recover service make. I read they have 100+ computer cluster and specialized program to perform decryption. Could they brute force random additional passphrase (25th word) to recovery seed?
Well if they had large number of Super PC they can bruteforce the passphrase fast..