Is it true that if you are making more than $50/per day on Adsense, google will manually check all your adsense sites?

Iv heard plenty of numbers. Maybe at one point they will manually check but I doubt its $50/day

I have a friend who runs many accounts, and he told me that the number was around $20/day.. and if he had something wrong with the site he would lose the account. Then he had better success with accounts registered as a company.

I don't think going above $50/day would cause or trigger any manual review. There are countless numbers of websites making multiples of $50 are they get reviewed probably no.
Also there are countless number of website whose adsense earnings get pass the $50 mark first time everyday ? will they go for each and every site to manually check them ? again the answer is probably not.

However if your traffic is not organic then your site might be kept in manual review box i think

i heard that it goes $50, then $100 then they review again at $500. This is why i would like to have multiple accounts