Yeah, the generated preview (depending on what application the link is shared in) can play a 30 second sample, but if you want to listen to the whole song you need to have an account, and if you don't have a subscription you'll likely get an ad first.

It's why I often share a youtube link instead, it plays inline a lot of the time and when it plays inline it often doesn't have ads. But that may also be because I have an effective ad blocker (for now).