I would imagine more engagement and less hostility / competitiveness. It also provides a personal feeling to the account without exposing your real face. It's surprisingly easy to spot those accounts just by "that sounds like something a guy would say"
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e.g. I talk about negative issues affecting men. I'm doing this fairly explicitly from a "Actually things kinda suck for everyone, but here are some male-specific issues you might not have thought of" perspective, and it helps to not have people pattern match me to an MRA.
Like generally if after we've had a proper conversation about this stuff someone would still think worse of me if they knew I was male, they're obviously not worth my time, but the ambiguity helps increase the chances of having that conversation first.