One of the very few lessons we should probably take from tumblrs playbook but making the platform so actively hostile to corporations by dunking on them and memeing them so hard that the mere mention of lemmy sends shivers down their CEOs spines. The advertising value of tumblr post buyout literally dropped to around 1% of its worth due to the active hostility within the community to any corporate interactions.
Also what ground would they have on a lawsuit? It's federation based, if they sue one instance to it shutting down another can just pop up.