In other words, if you in any way say "I think you should buy this", you raw afoul of the SEC, but just saying "I just bought this, and I think it's a good idea" you probably don't.
Now, would a service like that describe need SEC certification? Would the individual contributors? It can be constructed in a way that wouldn't, but that's far from trivial to either build it that way, or to even be convinced that it is for a contributor.
and re:"the violations of their terms", I meant their copyrights and the TOS you sign on. If I re-publish it (even if it's just by showing the whole world what I did), I might. It's not enforceable, but probably legal, and many such publications assert that you are not allowed to redistribute their advice in any form.