The reason the Amazons, Apples and Googles haven't jumped in is two fold:
1) ESPN and Fox, via their realignment manipulation, have hoarded all of the top brands into the 3 conferences they 100% own (B10, ACC & SEC) with the exception of Notre Dame.
2) Without access to regular season inventory of those top brands, there is little incentive for Amazon, Google, etc. to enter the CFB space including the CFP (which is illogically hoarded by only ESPN)
The obvious fix is media rights pooling and rational realignment into seven 10-team conferences (with top brands more spread out) and have the rights to those 7 conferences and annual shared CFP rights bid out NFL style. The rights could be bundled as follows:
1) SEC/ACC/Partial CFP/Two G5 conferences/Partial G5 Playoff => ESPN/ABC/ACCN/SECN has right to match other bids
2) B10/PAC/Partial CFP/G5 Conference/Partial G5 Playoff => Fox/BTN/FS1/FS2 has right to match other bids
3) SWC/"Big East"/Partial CFP/One G5 Conference/Partial G5 Playoff
4) Notre Dame/B12/Partial CFP/One G5 Conference/Partial G5 Playoff => NBC/USA/Peacock has right to match other bids
Package #3 would likely draw and could be shared amongst these 3: CBS/Paramount, Amazon and/or TNT.
Total media rights revenues would at least double and the SEC/B10 would continue their revenue advantage with an element of unequal revenue sharing based on regular season and CFP TV ratings (e.g. 25% of the total revenue pool shared unequally).