The context clue that helps you figure out the meaning of "hobby" is the phrase "until now the robots have just been a hobby." This suggests that the robots are currently an interest or activity done for enjoyment rather than for financial gain. The contrast with the idea of taking on paid projects implies that a "hobby" is something pursued for personal pleasure rather than as a job or business. Therefore, "hobby" refers to an activity that someone engages in for fun or leisure rather than as a profession.
Until now the robots has just been a hobby. If they start taking on paid projects robotics would be become their family business which context clue helps. You figure out the meaning of hobby
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