Money Market Funds - cannot understand if I like them

I have around one year of expenses in a Tagesgeld with N26 but as they did not move the interest rate even with the latest ECB increase I am considering moving some or all of it. Easiest logistical piece would be the Flexible Cash Fund they offer up to 2.29% however the more I read around MMF the less I trust them. How is the sub around MMFs? Do you use them? Should I just open yet another bank account to still use Tagesgeld but with better conditions? (I have a DKB, N26, Degiro and Scalable but