It's also complicated to switch apps because transferring routes, collections, photos, etc. to another service is difficult.

Not really, sync everything through Strava, and then drop whichever service you don't want. Basically any bike ride I've done in the past decade is on 3+ services because they all sync.

I think by routes he means the trails database, not user activity

Oh I can do it but I am not really representative of the average user.

Plus I have a lot of points of interest, note, picture, that I could request via gdpr but not easy to reuse and couldn't be imported into Strava.

Strava isn't better than Komoot on this regard.