Sega has historically had a surprisingly lax relationship with the Sonic modding community, even hiring fan game creators (like Christian Whitehead himself) to work on official titles. While they have not officially endorsed the decomp, they have notably refrained from issuing DMCA takedowns, recognizing the passion of the fanbase.
Users report that the decompilation often performs better on mobile devices than official ports, such as the Netflix Games version . sonic mania plus decomp