I want to receive money into my blockchain com wallet:
Under Wallets & Addresses tab, there are unused addresses (segwit) which I can add and label them.
So, can I use those btc addresses as receiving addresses permanently?
Although you have to know is that the reason why they changing the address and giving you a new and unique one is for added security. And of course you can use the addresses, but using them permanently means that every funds goes to the address and can easily be traced. It’s usually best when you’re steady changing the address. But it is still up to you on whatever you want to do and how you want it.
I understand but i will only receive money into that permanent address from one source repeatedly . For the other sources i will use different addresses.
I also understand your concerns about blockchain web wallet, but I couldn't find any other reliable/trustable web wallet which don't require KYC docs.