I'm sorry to see the state of the poor cat. I think that the cat is just responding to all the events of life he has endured and now feels very stressed and afraid and this causes him to use beds as toilets. Castrating may help but I suggest you try to give him anti-anxiety supplements if they are available, something like L-tryptophan, which can be mixed into his food
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Thank you for your feedback and advice! I completely agree with you, but now he is fine with the toilet.
Castration is required so that he does not beat other cats. Although if it is taken by people who do not have other animals, it can still wait.
I'm glad to hear that the toilet problem improved!