Calculate Market Size of two industries, based on 18 set companies

I need help calculating market size (total addressable market) for two markets, and on submarket of those. By market size I mean total business/turnover that is made - all together. If you can give an indication or idea to what margin or EBITDA is common in the market, that would be a huge plus. The most important delivery is sources, or communicating your logical reasoning, not only stating two numbers of market size. Part of the answer is understanding how you arrived at the particular market size, and convincing me you chose the right method. The two markets I’d like you to look at are. a. The online anti-counterfei / brand protection market b. The review aggregator market For each group I have a set of companies which are included in the market (you don’t have to search for more, but if you do find significant ones I forgot, and notify me of them, I will give you bonus though). If you can calculate market size by other method (including more companies than my list) that is ideal, my list is only a guide, and suggestion. In the online brand protection (case a) scenario, it is fair to assume the market is bigger than the listed 6 companies, as there are companies doing on and offline brand protection which has a piece of that market as well. To apply please give one example of a company you believe is a market leader in either one of the groups. If you really want to be chosen for the job instantly, you could write a short sentence on the type of method you would employ. - I might want to continue/expand this job, either within the job or in another posting to answer questions such as: how big is the market per location/language, and what specific service segments of the companies there are and the size of them, individually.