[reacweb]

Having more users even on the free plan gives many benefits: - more testers means that bugs are detected earlier. This improves reliability. - it gives more opportunities to try to sell the support and convert them into paying customers - it increases the visibility of your product. It is free advertising.

IMHO, the marginal cost is generally better than zero.

[slgeorge]

It's a trade-off.

The benefit is "reach" which is beneficial for (a) marketing (b) OSS community (c) bugs and contributors.

The cost are the (a) lower conversion to payment (b) costs from a 'shared' community e.g. community management and user support.