What is really the probability that CSAM gets included by any of the large KYC pools?

It seems somehow unlikely that such a block would be constructed by a large pool due to legal risks.

And if it is constructed by some other miner I could imagine that such a block would be orphaned by the other miners.

Yes it happened on the BSV chain, but who care's about that?

Data storage on the chain is undesirable, but this fear about CSAM seems exaggerated.