I disagree 100%. I started this game maybe 3-4weeks ago on my phone. 100% f2p and at lvl 60 paladin with 4,2k cp.
The TotS is pretty fair. make sure u got like 10m+ on you and click on two of the rooms when the countdown hits 0. Most likely u get in if u dont have any lag or so.
Press the coin button for 2sec and it starts autobuying. No need to spam clicks.
As a noob to game i got lucky and got kazarka weapon chest the 2nd day of event. Seem pretty fair to me. Less rewards the longer it takes to win abyssal items.
Just get into the room and the rest is rng :)