9to5Mac, quoting CNET:
Parler Chief Executive John Matze posted on his service late Saturday that Amazon had informed him it would no longer host his service on its Amazon Web Services platform […]
“This was a coordinated attack by the tech giants to kill competition in the marketplace,” Matze wrote, adding that his service had become “too successful too fast.” He didn’t initially address his platform’s comparatively lax moderation rules or its use by extremists ahead of the Capitol Hill riot. He also didn’t mention increasing concerns that social media apps, including Parler, were being used to organize another attack in the coming weeks.
Parler catered to a segment of America who they knew was problematic. They only have themselves to blame for this.