I don't think they are. Chelsea had the same criticism, Blackburn had the same criticism. Manchester City are where they are now - top of the pile with no real history of success - because of the money that their owners put in since they took over. Financial Doping is a buzz phrase used to be critical of them and its exacerbated these days by Twitter and forums so the term is churned out and in wider circulation.
Arsenal, Liverpool, Man Utd are exempt from the same criticism due to the fact they have historically always won titles and been considered "big clubs"
If the owners were Russian, or French, or English - people would still take exception to the level of investment they have made.
I actually don't care that much. In fact I like Man City, a club similar to ours that have to put up with their loud mouth neighbours in Red.
Fact is "Financial Doping" term is 100% fueled by Jealousy, it is not, in any way, shape or form, racism.
99% of it seems to be directed at Citys owners though. Why not at Everton and Liverpool for benefitting from the Houlding investment? Why is that not framed as "doping"?
It seems overwhelmingly directed at owners from a certain background.