The "digital plaza" ownership and total control on one's own community is a literal 2.99 euro/month VPS running mastodon away.

Shitposting one's thoughts by arranging pixels on a public forum is NOT a necessity, it's a luxury. If you value it as a necessity consider funding your own for yourself and others you care about, it would end up costing about 7 euro/year if you find even just 4 other like-minded persons.