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How used are the new tlds right now? What is the plan to use them? Won't it take people a long time to think .app for something?

There are some 4.5m of them sold to date, you can see usage information and sales data (and lots of other stuff!) here: http://ntldstats.com/

Usage data (or a rough proxy for it) here: https://ntldstats.com/parking/tld The names not used are parked.

IMO new TLDs are better than tryfoonow.com style domains.