I tried something similar which (if I remember correctly) had professional therapists and it was free. The person I was speaking to gave me very generic advice for 10 mins and then just stopped responding. After I had opened up about some very personal things.
It made me feel incredibly bitter and regretful that I'd shared such personal info for them to just disappear like that. And this was at a very difficult time of my life. It made me realise that some of these therapists do not really care or sympathise with us.
Obviously I just had a bad experience and there's probably loads of therapists who can be very helpful. I think it generally involved a lot of trail and error until you find the right one for you.