I believe they're a site that can be trusted. I've been a paying member with them for 2 or 3 years now (I won't be resubscribing for next year, but possibly in the future). They are a great resource of a fair amount of live recordings (some aren't that good quality, but many are great performances and very well recorded), and many of their midi files are pretty good too.
Their privacy policy is quite explicit. I never got any unwanted phone calls (well, not because of them anyway
).