Not the same thing at all.
Jack Philips was declining service based on who they are, not what they do. That is called discrimination. It is not discrimination, if Jack Philips refuses customers for not wearing clothes, swearing, or otherwise causing a disruption to his service.
The same pretty much goes for most corporations that offer people a platform. They're not required to let you do whatever you want, such as post pictures that are pornographic in nature or violent. Or rhetoric that promotes either.
Your concern shouldn't be little ol' me, who might agree with you on some things, or Imgflip, Google, Facebook, etc. Your concern should be with the FCC. An independent government commission that regulates communications. At times, they have more than overstepped their bounds when it comes to censorship.
Google and Facebook came under the scrutiny of the federal government after the 2016 election when these companies allowed foreign markets to buy political ads that contained false or misleading information. When the 2020 election came up, these same companies warned they would be cutting down on misleading information, in attempt to avoid another inquiry, to prevent being accused of foreign markets interfering with our election. Twitter thought it wise to join in that.
If it makes you feel any better, their efforts were rather fruitless as they got dragged before congress anyway for being too harsh on cutting down on misleading information. So, it is likely they'll reverse this soon or only be this critical during an election.
You're talking about free reign with zero censorship. No company is going to profit if they give a platform to people who openly harass others. There is no excuse for this no matter why you believe you have a right to harass people. And companies may absolutely refuse service to hostile customers that threaten their integrity of offering their other customers a safe and secure product.
Any company can defend it's interests against an individual; as long as they're not discriminating against that individual. Much as Jack Philips may have done.