Some banks address the use of financial aggregators like Cleo in their T&Cs and understand the benefits of using these services, others advise a bit more caution.
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We understand that it's a bank's responsibility to ensure that their customers are careful with their passwords to help prevent fraud. 

At Cleo we take security very seriously. We could not, and would not, be in the business if privacy and security was not a prime concern for us. That's why we use state-of-the-art security practises and follow a strict industry-standard approach towards this. We want to build the banking experience of the future, and that vision is shared by many governments and organisations around the world, including the European Commission. Banking must move forward, and we are helping ensure it does so. 

Banks are right to advise caution when customers use their credentials with other services, but for the most part, it's up to you if you want to enjoy a smarter, more convenient way to manage your finances.