I just don’t understand investing in chat app companies. Throughout my life the popular chat app has totally changed every few years: ytalk, aim, icq, msn messe

I just don’t understand investing in chat app companies. Throughout my life the popular chat app has totally changed every few years: ytalk, aim, icq, msn messenger, yahoo messenger, gtalk, bbm, skype, fb messenger, sms, group me, iMessage, whats app, slack, discord What is the chance that people will still be using slack in a few years. Esp considering mattermost is free and discord people argue is better today. It’s great they tried to build a biz on office chat, but it seems overpriced considering it’s just another chat app