I think it is because, legally, they had no reason to ban him in the first place.
They censored a sitting President of the United States without any due process and without proof he did anything wrong.
Now he is a candidate for President, and again, legally, they cannot censor him without cause, because that would be election interference.
Plus they are losing money and now need the traffic that Trump used to bring, to strengthen their bottom line.
They hope to avoid a lawsuit this way. Zuckerberg and Meta never thought they would have to answer for their actions as agents of the Deep State against Trump. The Dems obviously did not steal enough votes to keep the House (like they did the Senate), so this all is seeing the light of day.
Thanks, that makes sense now, the timing with the new Republican house.
Like they think nobody will notice they interfered with the last presidential election!