The opening paragraph is marketting speak so it doesn't out and out say anything anti-capitalist, but the logical inference does try and target those that worry about multinational corporations.

"A decentralized alternative to commercial platforms, it avoids the risks of a single company monopolizing your communication. Pick a server that you trust"

It's offering an alternative to commercial platforms, trying to imply that you wanted that. It's implying that you are at risk and at the mercy of a monopoly.

Ultimately it will fail, playing on people's fears backfires. Always play to your strengths.

It's hard for new entrants because Facebook is being responsive to its users. This isn't sustainable over the long term, people at the top will change and priority will shift to short term fiscal returns.