、。
Why do they even make it available to rival competitors?
Literal
Why, rival [genitive-の] same-industry-competitors [to-にまでも] publishing-doing [copula-のか].
A rhetorical question expressing surprise. ライバルの同業者 ('rival competitors in the same industry') stacks two synonymous concepts for emphasis. にまでも ('even to the extent of / even going as far as') is a triple particle stack: に (target) + まで (extent) + も (even), expressing 'even to X.' 公開する (こうかいする, 'to make public / to publish') is the action being questioned. のか at the end frames it as a genuinely puzzled or indignant question.