PSA: Stop complaining about ping spikes if you play on Wi-Fi.
Thank you.
While obviously this doesn't solve EVERY issue, using a cable into a router significantly lessens any significant spikes and DCs. Most of the time, it isn't a server problem, it's your own fault. And using a cable generally tends to fix that problem, unless you have a bad ISP.
tl;dr, Only complain AFTER you've used an ethernet cord and it continues to fail.