First i see there's a mistake on the sentence, it should be:

"Working for free adding value to platforms like tripadvisor or facebook without any returns is a model that should end"

Now your question, what i think is this: A model where you give value and receive nothing is return is not fair and should be replaced with another where there's a return of value somehow. With tokenization it can be done. You only have to "tokenize" the demand for services that the platform will generate, that is asking tokens for advertising, or for using the platform's services and data. Once you have that, and there's a return, the circle is clear, more value you add, more token demand, more value your return will have, more incentivized you will be to do it better and receive more token.

Increase of credibility? Well, that depends of course on how you implement the model, in our case, with internal ponderation and spam control, it will of course increase credibility. Users will have a good reason to include good information, to weight the information of others, etc. The more you do, more token you will receive, the better you do it, more value will have the token in the market.