-At the top of page 2, the sentence "These computing platforms avoid single points of failure (the server) but, since they need a certain amount of infrastructure installed to start, the threshold to join them is much lower; this makes gathering new users immediate and spontaneous, so that they can be used for short algorithms on call." is quite confusing. The use of 'but' makes it seem like the second part will be something negative (since the first part was positive), and this does in turn seem to be the case with "they need a certain amount of infrastructure installed to start" but then a positive is stated: "the threshold to join them is much lower". I would think you are trying to argue that less installation is required by the users so they are more likely to join, but this is not at all clear from how it is written.
-At the top of page 2, the sentence "These computing platforms avoid single points of failure (the server) but, since they need a certain amount of infrastructure installed to start, the threshold to join them is much lower; this makes gathering new users immediate and spontaneous, so that they can be used for short algorithms on call." is quite confusing. The use of 'but' makes it seem like the second part will be something negative (since the first part was positive), and this does in turn seem to be the case with "they need a certain amount of infrastructure installed to start" but then a positive is stated: "the threshold to join them is much lower". I would think you are trying to argue that less installation is required by the users so they are more likely to join, but this is not at all clear from how it is written.