Not relly true, eg YT, there are still several scripts to gut out ads, tracks and nags from YT (take a look in Greasyfork or OpenuserJS) (for YT naturally filter the newest and recent updated scripts), if one of the front-ends dont work.
Well, OSM and forks or Here maps don't have the features of Gmaps (eg Street view) but are way enough for the most use.
For translations, OpenSource isn't sinonimo of bad, eg, CrowTranslate for Desktop or the Linguist extension for the browser are FOSS and maybe the best you can find out there, multiengines for more than 120 lenguages, they use the APIs of Google, Yandex and others (customizable, Linguist use also the Bergamot Translator(At the moment still in developement and only EU languages, but they'll add more soon)), similar to the front-ends for YT, so Google isn't a problem.
Yes, naturally if you are an Google user for your work, few you can do, but there are alternatives to use Google only the minimum needed.