I really hope it helps them build a decent app, but I doubt it. In Ukraine, there's a huge problem of Telegram being so feature-rich compared to WhatsApp that it's impossible to convince people to do the switch, even under the national security threat.
If one should switch, why should they switch to WhatsApp instead of something more privacy-friendly as Signal?
I'm a much heavier Signal user than WhatsApp but for broader audience it not even serious to consider. Too slow/laggish, lacks features (at some point it ate 40GB of my phone space -- with no good UI to clean it up), crashes etc. Not ready for this kind of scenario, unfortunately.