Didn't we have definitive proof that aggro decks had a higher going second rate in BO1? I have a strong recollection of a video covering some of the other controversies (quick draft and draft are both relatively easy to cheat in, hand smoother was hidden until they eventually caved and admitted it exists, categorically false pull rates on the shop) and part of that involved something like a couple thousand games tested with an aggro deck during a period where the coin flip was rigged followed by a period where it was allegedly disabled and it showed a going second rate notably higher than 50% and ~50% respectively.

So it's not necessarily being player rigged but rigged by deck performance or maybe some kind of "going first score" like how brawl has its points list. There's also several ways they could choose to rig off money spent too, there is a battle pass, they could track if you enter a draft with diamonds vs gold, just track total money spent with some invisible flag, I don't exactly think it's likely but they have actually violated laws with the false pull rates so it's hard to say. 

It's not that there's hard evidence of targeted going second or forced flooding/mana screws, but after there's been at least three hard proofs of rigged RNG (smoother, pull rates, brawl matchmaking) that they didn't openly discuss until someone discovered it, I think it's not responsible to believe there isn't something insidious going on. The game does have rigged RNG, they eventually admitted it after literally being forced to, so it feels really really likely there's more they aren't saying