There are still some of the non-gambling campaigns that have seen currently. But yes, it's not the same as before that there's a bunch of them due to ICOs or altcoin/token projects.
None of those non-gambling campaigns lasted than few weeks and in exception for some no kyc exchange platforms who lasted for few months before living for various reasons. Casino are always there running longtime campaigns considering bitcointalk is their best channel to promote crypto gambling.
Yes, no doubt that the gambling campaigns are still superior compared to the non gambling campaigns. Because they're more getting the exposure and the results of the marketing they're doing through here.
I noted how mixers run signature campaigns in another forum after banned from bitcointalk, they pay low rates compared to bitcointalk. Casinos don't promote in that forum whatever how much low is the rate.
I am not focused in that and not following it but I guess the low rates are due to the ranking of that forum compared to Bitcointalk.
And maybe some casinos have already advertised there.