Case and point the UKIP in 2018 and 2019. They literally got two e-celebs (
Soygon and Dankula) to run as MEPs in their respective districts in a failed hope to boost party ranks. In spite of both channels having hundreds of thousands of subscribers they only got 28,418 votes in Scotland (1.8%), and 53,739 in South West England (3.22%) respectively. In total UKIP lost all of it's seats in the European Parliament, it's political leadership got raped, and the party practically destroyed itself because of the fallout with Nigel Farage rubbing salt in the wound by forming the Brexit Party.
Keep in mind at the time these two were
political e-celebs. If political e-celebs have no hope of boosting a party and instead crash it, what makes anyone think that a normal e-celeb could do so without alienating a significant portion of their audience?