Wagering requirements are the part of an offer that decides whether it is worth anything, and they are written to be skimmed past.
The arithmetic. A bonus with 30x wagering means the bonus amount has to be staked thirty times before anything can be withdrawn. Take a ₱1,000 bonus at 30x: that is ₱30,000 staked in total. Not lost, staked, but it is a lot of turnover on a ₱1,000 head start.
Then check whether it is 30x the bonus or 30x bonus plus deposit. The second is more than twice the work for the same headline.
Game weighting. Slots often count 100 percent, table games frequently count 10 percent or less, and some games are excluded outright. Clearing 30x on a game weighted at 10 percent means ten times the turnover.
Maximum cashout. Some offers cap what you can withdraw from bonus winnings, no matter how much you win.
Expiry. A requirement you cannot physically complete in the time given is not a real offer.
None of this makes bonuses bad. It makes the headline number close to meaningless on its own. Post an offer you are looking at and we will read the terms with you.