Their patent-busting activities are fairly focused on telecom-held patents which are overly stifling of innovation. Their general stance against telecom-enabled broad government surveillance also indirectly harms telecom bottom lines. I could go on, really.
I am genuinely curious if you can provide clear counterexamples which appear motivated by alignment to telecom interests though.
Edit: In the name of playing devil's advocate, I went searching for examples that could be construed as benefiting telecom interests. The only one I can point to from recent history is their initiative to enable "Broadband for All", which includes advocacy for public funds to go into building out fiber infrastructure. While this may benefit telcos, it also seems unambiguously to be in the public interest and particularly benefits rural and underprivileged populations at the cost of wealthy urbanized ones. [1]
I also looked for evidence of meddling in their financials, but found only a transparent 501(c)(3) which has maintained a grassroots funding, with most funds coming from small individual donors. They are also a top scoring non-profit on Charity Navigator for their financials. [2]
1: https://annualreport.eff.org/#broadband 2: https://www.charitynavigator.org/ein/043091431
https://thebaffler.com/salvos/all-effd-up-levine
https://news.bloomberglaw.com/privacy-and-data-security/face...
They've accepted millions of dollars in donations from organizations and their executives' foundations that they're ostensibly a watchdog for. Their being okay with the conflict of interest is reason enough for me not to trust them.