"Why do startups write announcements like these?" I've been at a bunch of companies with a bunch of raises. 100% of the time, the announcement was an excuse for press. If you can come up with any excuse to get an article published in a bunch of tech press (other than "CEO arrested for embezzlement + harassment at the same time"), you get a bunch of free advertising. Bonus points if your target customer tends to read…
TL;DR: It's an appendix slide in your first meeting deck, don't put it up front :)