Lets not forgot what those guys did for Wano like plundered, people was suffering from many desease like: poverty, famine, lose their homes, children was taken to brothel, litteraly contry was turn into living hell, and only capital was full of prosperity. Like even Big Mom never did things like that to people that she rules. Actually people even enjoy living on her territory in some way. Like cmmon BM created country of somewhst dreams, it's absolute opposite thing to Wano.
Also Wano is closed country and it wouldn't became part of WG for a shirt time. Also there are no reason to keep criminals like that alive.
I believe most of them will be executed...
Someone will pay with helping rebuilding county, turned into slaves...
Maybe someone will get mercy and will be withdraw from country.
Like Kaido Pirates keep people suffering for 20 years...they poisoned water, destroy everything...so no mercy for them.