Whenever someone would publish their experiences with AllArk on Reddit, the thread would get "downvoted into oblivion", with some people raising concerns of them themselves using bots to do so.

I also remember seeing an email log of a user "losing" a couple of hundreds to that same entity. I thought that was on monero.observer, but cannot seem to find it now.

Maybe someone else feels inclined to dig something up, but in general, just be very careful with what people recommend in the space. Most of the time they saw it mentioned somewhere and, with best intentions, just pass it on.

Yeah that experience doesn't sound too great. I think with allark they don't ask for a name and email, but the fee might be higher (as last time I checked their XMR price was lower than the rates I found elsewhere)