- There is 0 absolutely 0 support. All you can do is go on their community forum where no one replies to you
- There is no alternative, there are other ad networks, but they require you to have a working Adsense account as a prerequisite. I was in one once, what they did was just put Google ads on my site and take an additional 10% cut
- Google takes an excessive cut. Officially they collect a 30% intermediary fee, but according to the DOJ lawsuit there are 15% that are somehow unaccounted for. So it seems the number is more around 45%
Google is a complete blackbox that pays no taxes thanks to a web of subsidiaries and loopholes and so there is only limited knowledge about their financials (although it is a public company), there is mounting evidence that they manipulate search queries/results in a way to increase their revenue and are siphoning more money than they should from their Adexchange. They also use anti-competitive practices to maintain their monopoly on web ads and the list of malpractices is too long to put it in writing here.
This company is an absolute nightmare and I am forced to use it for ads because they control the market.