If you are able to host these apps, then absolutely, you are encouraged to do that.
Many don’t have the resources or knowledge to make sure all your sensitive data is safe, backed up, and available to you. It’s Open Source, and the free is the sense of giving freedom to those who use it.
Do I need to have my website hosted with CanTrust to use the canWork Cloud?
Best practice is to keep your data and public facing website separate for both security and compliance reasons. You can take advantage of canWork Cloud for all your business needs and host your public facing website anywhere.