I wonder why you think so. Some like Peertube & Threema are definitely poor alternatives but I wouldn't say it's "almost all" either.
- Deezer vs Apple Music/Tidal: Deezer has a great selection of music and recommendation algorithm. I've never used Tidal but Deezer is definitely better than Apple Music IMO.
- Tuta/Mailbox.org/Posteo vs Gmail: Well, they all let you send and receive emails. Unless you're an enterprise user, I don't see what advantage Gmail would have over the others.
- HERE WeGo vs Google Maps: Very recently installed HERE and didn't have any issues so far. This can be a bit location-dependent though.
- Ecosia vs Google: Ecosia uses Bing/Google^1^ as its search index anyway, so the results are almost exactly the same for me.
- DeepL Translate vs Google Translate: DeepL has a more limited selection of languages but for the languages it supports, it's the undisputed king.
- Bolt vs Uber: I only used Bolt a few times while I was in Portugal and it seemed fine. Maybe this is also location-dependent.
^1^I think it's Bing by default but you can configure it to use Google in the settings.
It's amazing how fast it is, even for uncached queries. For cached ones, it retrieves results before I can even mentally register that I pressed Enter.