The reason we didn't call it a "free trial" is because you can still keep using the service after 30 days. Some SAAS products have free plans that have caps on the amount of data you can create. We're basically saying the cap of data for the free plan is whatever you create in the 30 days -- that could be hundreds or thousands of bookmarks. You'll still have access to everything you own after the period but more importantly, if you weren't satisfied with the service you can export it all anytime.
Hope that clears things up a bit.
I don't know, suddenly I wasn't so inclined to give it a go. Maybe it's better to be brutally honest.
I think this entire line of discussion is coming from a place of thinking way too much about it. Tinmark's cofounder's answer above is exactly what I was going to say. There's nothing dishonest about and below the headline there are 3 lines of text that very clearly state what a user would be getting. There's nothing ambiguous about the explanation.