Sorry, but in comparison to daily streaming and social media traffic, MSFS isn‘t even a spec of dust when it comes to traffic …
Even when millions „pull the trigger“ at the same time - MSFS is really a very small corner in the vast ocean called internet - the ISP would not even notice the launch …
And why should this be a problem for MSFS with a download of under 50GB (around 27GB if I remember correctly) and maybe 2 million (best case scenario) users the first week, and not for the newest AAA titles weighting over 150GB and tens of millions of user… 