Not long time ago I played in one that requires x3 wagering (won't tell the name so as not to harm them).
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If the casino has already warned players about it in their terms of use, then there's really no harm in sharing that information publicly. I mean, it's not like it's a secret or anything. Plus, there's a whole list of other platforms with the same practice, so it's not like this is something unique. But, if the casino didn't even mention the wagering requirement in their terms, then it's only right to put that info out there so others can make a more informed choice.
I guess that you are right. It's just that directly criticising a competitor while wearing certain signature didn't seem decent to me. It would be natural and many members are doing it here; and, as you said, it is the responsibility of each one to inform themselves about the terms of each site. But I try to follow the "mention the sin, not the sinner" rule (a bit different in English, but I prefer the Spanish version).
Said casino explicits the wagering requirement in their T&Cs, so there's nothing to blame them for but I still prefer not to mention their name. The idea I wanted to share, and what is most importante, is just that I didn't know such high wagering requirements existed and I was socked the first time I saw they asked me a x3 being a normal user.