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Creating a multi-account for the sake of welcome bonuses is a pointless idea, because, as you said, almost all gambling platforms set wagering requirements for bonuses, and as a rule, these requirements are too high, which makes the pursuit of bonuses pointless both for the average user and for the avid abuser who has many accounts.
I am that gambler that is hardly interested in bonuses offer of which I just make sure to have just one account with any reputable gambling platform of my choice that services meets my expectations. For those bonus abusers they don't bother about the chances of losing the bonuses on attempt of reaching the wager requirements for it. The greed that fills them to want to cheat makes them ignores that part.