Limited traffic / static pages only / free advertising for other products that bring in revenue. Do you think there are more insidious 'catches'? I am struggling to come up with one.

i guess i would not have thought someone would have referred to such a service as 'free' -- at least, among the HN crowd.

but yeah, that makes sense.

p.s. i used HN Replies to see this comment. https://www.hnreplies.com/