TY JOUR TI Business models in terms of digital economy KW business model KW SaaS model KW subscription model KW marketplace model KW freemium model KW online platform KW digital economy KW target audience KW cloud solutions KW revenue KW competition JO Economic and Social Research AU Pershin, E.V. AU Koloskov, A.I. AU Shikalov, M.S. AU Artemenko, V.B. AU Gabrukh, A.Y. PY 2026 IS 13 PB National Research University of Electronic Technology