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I run my SaaS https://focuster.com on Meteor and I have also built several SaaS projects for clients using Meteor as the base. Some have criticized the scalability of DDP. While out of the box the real-time reactivity won’t scale infinitely, the community has released packages like https://github.com/cult-of-coders/redis-oplog which is a great solution for scaling.

If I had to start over I’d probably still use Meteor but with Apollo as my data layer instead of DDP/pub-sub.