If you can identify a niche and keep your costs down then you might have a chance. Apps targeted at enthusiast cyclists continue to do well, for example, although I have my doubts about expenditure vs revenue for some of them. (Disclaimer: I run a small-scale cycle routing app/site.)
But "people who want to get around Western European and North American cities" is not a niche that Apple/Google were ever going to overlook.
[1] "Citymapper investors are mostly not making their money back in the transaction and that it’s effectively a washout": https://techcrunch.com/2023/03/16/via-acquires-trip-planning...