I am not sure why anyone is surprised or this should even be news. I don’t have a speck of business education and I can see this is no way sustainable. “Free forever” is not a sound business strategy (shock emoji). If it is free, like Youtube, Reddit, Zulip, than expects them to profit in some other way. If you can’t explain how a business profit you shouldn’t use it because:

1. Its not going to last.

2. They are doing something shady.

Apply this to any companies, even your family’s.