If it has stopped working, that might be an indicator that it is unreliable, but I do not know enough to say so with confidence. I use Nord VPN, it's relatively inexpensive and very good.
The one I use requires a master password that only I know, and it led to me overhauling all my passwords - for a long time I used the same one everywhere, now it generates them for me and then remembers them, linked to whichever site it is relevant to.
For all I know your fear my be valid, however, so far, nothing malign has happened (as far as I know).