The phrase "a platform against" is correct and usable in written English.
It can be used to describe a medium or space that opposes or challenges a particular issue, idea, or group.
Example: "The organization created a platform against discrimination to raise awareness and promote equality."
Alternatives: "a forum opposing" or "a venue for resisting".
Pitching authenticity, she said, is a "platform against a tidal wave of new competitors".
The democrats will never pursue a platform against corporate power when so many of their donors are corporations.
Gatland has made three changes to his tight five after the failure to provide a platform against England.
Still, he won the vote on a platform against corruption and thousands of cheering supporters welcomed "Uncle Jona" into office.
He created an army (by conscription of peasants) and a separate financial administration, but he may have wanted a platform against the Danish nobility to work for absolutism.
A score of liberal political parties, trade unions and non-governmental organisations in northern Cyprus have formed a "platform against oppression", denounced the arrests and demanded the immediate replacement of General Ozeyranli.
Then they had to cross through the throngs to climb a platform placed against the wall of a building (voters weren't allowed inside) and pass their ballots through a window and into the hands of an election judge.
For the apes, the procedure was the same except that the E1 sat down behind a platform flush against a mesh panel while subjects sat on the opposite side of the mesh facing the E1.
The PDI-P, as an opposition party, has a clearer platform: against privatisation and for stronger workers' rights.
The action takes place on a raised platform against looming concrete walls and a sinister iron staircase.
In terms of effort and confrontation, we built a strong platform against the best team in the league, but we were not clinical enough".
