There definitely is a lot of stupid money floating around in this space. Lots of companies that are competing with each other for the same group of consumers. So, it's a race to the bottom in terms of pricing and operational cost. All the under-performers struggle to keep users on their platform and quickly fail if they don't sort out their operational issues. Some of the more successful companies have in common that they are a bit more premium in pricing and reasonably well organized when it comes to operations and relations with local governments (key for even being allowed to operate).
I don't use scooters but I do use a lease bike (Swapfiets), which is very popular here in Berlin. Good old pedal power and I don't mind getting some exercise. They also have ebikes but those are a bit too pricey for me. The scooters look fun but also too unstable for my taste. I like having teeth and I can see a gazillion ways loosing those with these contraptions. Ebikes are nice. I've used a few of those over the years: Uber, Tier, etc. All good fun and pretty effective.
Key challenges in this space are the continuous haggling with local governments about rules and legislation and the continuous drain on cost in the form of maintenance, vandalism, theft, etc. It's just a very operations intensive business and companies that don't do that well don't last very long.