I have this thought that developers are not using custodial wallet or using it with a minimum amount to transact, they are the educated ones in this industry, am wrong on my assumption.
Being a developer doesn't necessary mean knowing everything about cryptocurrencies. Obviously, he was using it just to receive payments from his clients as he is from a country where almost all other payment methods are banned.
the problem is most websites blocked syria access
You should avoid using web and custodial wallets at all costs. Use an open source non custodial wallet where you will be the only one who have control over your coins.