Several issues:

* VPNs are mostly not free, and with current situation in Russia, you can't easily pay for the Europe/US service due to absent Visa/MC service

* Popular VPN providers are getting blocked in Russia recently

* For the major websites, such as Instagram and Twitter, VPN access almost instantly triggers additional checks, cellphone number validation, account block, etc.

* VPN connection increases latency and reduces speed

While GoodbyeDPI is free and autonomous.

AND it can unblock VPNs, too! For example, the latest build can unblock blocked ProtonVPN by inserting fake TLS packet during OpenVPN TCP handshake.