Yes that's absolutely a lot considering the code to solve Patreon's business problem has been written long ago and works just as well. The core business problem can be boiled down to a set of spreadsheets - based on payments going in and creators subscription timeframes you work out the payout for each creator. If it takes you 150 engineers to do the aforementioned I'd look at you in a funny way or start suspecting ulterior motives (and in this case there indeed are ulterior motives - hint: the objective is not to build a profitable product).