To sufficiently comprehend the evolution of the enslavement of B’nai Yisrael in Mitzriyim, it would seem that one needs to comprehend the closed nature of the two preceding Parshiyot; the concluding posuk of Vayigash;
And Yisrael dwelt in the land of Mitzriyim in the land of Goshen, and they acquired property in it and… multiplied greatly
and the first posuk of Vayechi;
And Yaakov lived in the land of Mitzrayim for seventeen years…
We need to understand the gist of the Kli Yekar; that the Sh’vatim, the Am, knowing that they were to be in Mitzriyim for a definite period of time beyond their lifetimes thus perceived a permanence. Therefore, they adapted themselves to living in Mitzriyim long-term and were thus vulnerable to Mitzri “encouragement” to melt, to assimilate into Mitzri society, to work for the nation, etc. The B’nai Yisrael began to accumulate wealth, land, assets, material possessions as they grew in numbers from 70 souls to 600,000 during Yaakov’s 17 years in Mitzrayim, as stated in the Judaica Press Chumash volume 3 re: Parsha Vayechi.