Enterprising Cloud Base Services Worth Or Not ?

It has always been to me that cloud computing is playing a key role in improvisation of IT at low costs, but simultaneously the thing that was always in my mind was that security  incidents and cyber attacks have been the main concern for cloud computing and also for companies that have invested a lot of capital in it . 

The reason I am embossing this topic is that while I was going through some websites I found that many major websites have crashed down simultaneously like NETFLIX , UBER , BBC . The cause of this  simultaneous shut down is still unclear. But one of the main reasons of this would be service interruption in cloud services.
https://economictimes.indiatimes.com/tech/internet/dozens-of-major-websites-crash-all-at-once/articleshow/49402760.cms
also, there have been many incidents regarding cloud service interruptions . 

The following are the two categories that companies should look into while investing their capital,
 (1) MANAGED IT SERVICES 
(2) CLOUD SERVICES . 
In managed IT services there is less dependence unlike cloud services where every thing is remote. 
So before choosing cloud services companies have to think twice whether the services will be really worth to the invested capital. In case of failure in  cloud services,  time taken to recover and data loss would lead to confrontation  between the client and the company ( not the cloud service company ).

HENCEFORTH, before selecting a cloud service the key factors  to be considered  are -
(i) security and compliance 
(ii)service availability
(iii)service level agreements
(iv)performance and versatility 
(v)cost 
(vi)maintenance and sustainability 

THIS POST IS NOT  AGAINST  SELECTION OF CLOUD SERVICES .