Signal produces lots of metadata on AWS. At least use Molly without a phone number. Just giving you best practice suggestions. Why go for a worse product when you can have the best for the same price? You are responsible for yourself, but assume that your decisions also make life easier or harder for those people that absolutely depend on havinna secure and private communication network. If only few people use it they are much more easy to single out. Conclusion: Your decions and consequent actions therefore have a marginal effect on my security and privacy and vice versa.