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Generally you can exchange some amount of money in return for not seeing ads...

Is it really a worthwhile platform if you have to buy a file manager?

FLOSS file-managers were decent already in the 90s.

I'm pretty happy paying for things I like. Solid explorer is a great file manager for Android that I also pay for.

I know paying money for goods and services is passé in this economy, but yes some things need you to invest money into them.

That's a good way of course, but there's also the option of using F-Droid.