Probably shouldn't tell border patrol you're doing unpaid labor in a country you're visiting. When speaking to authorities it's best to say the absolute minimum required for the encounter.
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I was travelling to Ireland(Dublin) as a tourist and during questioning by a border agent I mentioned that I might check my email (they noticed my laptop), the border agent simply advised me that my visa did not allow work but since I was clearly being transparent about my actions and intentions that there was no reason for them to block me or require me to apply for a working visa, so after what was a friendly chat, I was on my way.
I've also had similar interactions in other European countries such as Germany(Munich) and the UK(London Gatwick) - both of which are particularly thorny about economic migrants posing as other types of visitors or asylum seekers, again no problems and the staff are courteous while conducting their duties professionally.
Meanwhile my last trip to the USA during Trump 1.0 involved the border agent not even speaking to me, but instead holding out his hand for paperwork - so I'd hand him a paper, and if it wasn't the one he wanted, he'd flick it back at me. It's obvious he's just trying to start shit so he can have an excuse to abuse the power granted to him. (LaGuardia Airport).