They should switch to an SOC with mainline Linux support so you don't have to throw it out in three years.
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Starting 20th of June this year (so 3 days ago) every new phone released in European Union will need to have software updates for at least 5 years from the date of the end of placement on the market. This might be the first one released under new regulations. Also looking at Fairphone's history it looks like they really support their phones for a long time.
This is why using SOCs with poor support and closed drivers like this is a terrible idea.