You missed reason 0:

0. It is the default. Almost all computers today come with Windows. If someone clearly unknowledgeavle were to ask the salespeople in any PC store, they’d say some variation of “just use Windows”.

Microsoft managed to make sure “a PC” almost exclusively means “A computer [with Windows]”.

Procrastinative Mindset.

Short answer: the bank won’t give your shiny new tree-planting business a loan as easily as it will to a “liquid tank tree replacement” one.

Long answer:

• Trees take time to grow
• Trees need to be planted
• Trees make shade
• Animals like birds and insects like bees and mosquitos like to live next to them
• Trees don’t need electricity
• Trees take in heat radiated from the pavement
• Trees don’t look cool

While algae are more efficient at turning CO2 into oxygen in theory, in practice algae don’t have a good climate in such a tank (no oxygen without ventilation, i.e. constant electricity and they get cooked through the glass).

All in all, more of a gimmick than anything.